sqlconnection open timeout

I suggest rolling your own timeout. it's often useful to increase this for Azure SQL DB. The code opens the connection and displays the ConnectionTimeout property in the console window. Connect and share knowledge within a single location that is structured and easy to search. I can only suggest trying a similar chunk of code in your network environment and seeing if you continue to see long timeouts. He's not talking about the command timeout, he's talking about the connection timeout. IF i have alargeconnections how to avoid timeout problem. The SqlCommand.CommandTimeout does what you want to do. Here is an example of our connect string: server=myserver;database=MyDB;Application Name=API;integrated security=SSPI;persist security info=False;Trusted_Connection=Yes; I suspect that we may have forgotten exhausted the connection pool. CGAC2022 Day 10: Help Santa sort presents! How do I put three reasons together in a sentence? Hopefully that could be deduced from the fact that the servers I want to fail more quickly are turned off. Connection Timeout is for the amount of time it takes to resolve the initial connection to the database. Max Pool Size- specifies the maximum size of your connection pool. at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject . I don't believe this is true. You can set the timeout value in the connection string, but after you've connected it's read-only. The rubber protection cover does not pass through the hole in the rim. Edit: It seems that the setting only fails sometimes. A cleaner way is to set connectionString in xml file, for example Web.Confing(WepApplication) or App.Config(StandAloneApplication). You might find that the thread doesn't actually shut down until the "real" timeout occurs which may prevent the application from shutting down promptly but this approach would at least allow you to test multiple servers in quick succession. Avoid using links only, the links could change in the future. In the below two lines of PowerShell, we specify a connection timeout of 0, meaning that the script will run as long as it takes to complete. We tried to get a stack dump too, as part of it. CommandTimeout impacts timeout when running a query. This helps narrow down connection pool hogs: COUNT(dec.session_id) AS connection_count, INNER JOIN sys.dm_exec_connections AS dec. You can use SQL Server profiler to see the connections on the database. ConnectionState Enum (System.Data) Describes the current state of the connection to a data source. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You need to clarify. Old (incorrect) answer Default is 15 seconds. An asynchronous version of Open (), which opens a database connection with the property settings specified by the ConnectionString. The SqlCommand.CommandTimeout does what you want to do. The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections. Microsoft makes no warranties, express or implied, with respect to the information provided here. Edit: Sorry if I was unclear. You can set the connection timeout to the connection level and command level. at Microsoft.Data.SqlClient.SqlConnection.Open() at WebApplication4.Controllers . Why is there an extra peak in the Lomb-Scargle periodogram? This specifies how long time the SQL Server service has to respond to a connection attempt. @Sam Pearson It is read-write right up until the connection is opened i.e. SqlConnection.ConnectionTimeout is "the time (in seconds) to wait for a connection to open. Should I exit and re-enter EU with my EU passport or is it ok? confusion between a half wave and a centre tapped full wave rectifier. Try setting SqlConnection.ConnectionTimeout instead of using the connection string. I really, really don't see why they made the property read-only. do you mean commandtimeout? Techie details: This will look at how we determined what the problem was once we had a memory dump of the process. . For example, if you are connected to your database through SQL Server Management Studio for longer than 30 minutes without having any active request your session will timeout and because there are no active requests SQL Azure can't return an error. Add "Connection Timeout=10" to the connection string. Asp.net MVC (.NET 4.0) web app running in IIS 7.5. The default value is 15 seconds. SqlConnection myConnection = new SqlConnection(); myConnection.ConnectionString = " Persist Security Info=False;Integrated Security=SSPI;database=northwind;server=mySQLServer;Connect Timeout=30"; myConnection.Open(); The time (in seconds) to wait for a connection to open. This contrasts with the behavior of HttpClient which fails almost immediately when trying to send an HTTP request to a bad DNS name.. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. This forum has migrated to Microsoft Q&A. How do I calculate someone's age based on a DateTime type birthday? How could my characters be tricked into thinking they are on Mars? connection.ConnectionTimeout is also used for committing and rolling back transactions. property or indexer cannot be assigned because it is read only. Connect Timeout- controls the wait period in seconds when a new connection is requested, if this timeout expires, an exception will be thrown. C# how to test database can be connected in fast seconds? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If it fails to reach the server and get a response back immediately, then that's basically a connection timeout, which is why it would make sense to use that way. SqlConnection.CommandTimeout (Microsoft.Data.SqlClient) () 30 SqlConnectionStringBuilder.ConnectTimeout (System.Data.SqlClient) () Show more Previous Versions Blog Contribute Privacy Terms of Use Trademarks The timeout issue can be also caused by the database server. An interesting thread on this issue here: Wow, what a pain. Here is a better example of the exceptions we occassionally see: TypeName: System.Data.SqlClient.SqlException, TypeAssembly: System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089. Some information relates to prerelease product that may be substantially modified before its released. Connection Timeout is different from CommandTimeout. Not the answer you're looking for? The time (in seconds) to wait for a connection to open. I think your answer is the cleanest. 00:00:30 [LockTable] SqlCommand times out here (default timeout was 30 seconds) and connection is sent back to pool [_stackNew]. But as you said, the connection The best way to check if time out is working is to open your connection wait for Connection time out (Task.Delay) . "Connection.ConnectionTimeout is also used for committing and rolling back transactions. pool is likely the problem here. The firewalled machines fail faster, though. The default value is 15 seconds." They have a nice script that shows your connections to SQL by app / machine. Do you mean to set a connection timeout after you try to open the connection? Like it knows the IP address of the server, and is using TCP/IP to talk to it (not local) but can't contact SQL Server at that address? Find centralized, trusted content and collaborate around the technologies you use most. You cannot set this value directly, you'll have to set it as part of the connection string: Data Source = server;Initial Catalog=databaseUser Id=username;Password=password;Connect Timeout=30 Note that the value is expressed in seconds, not milliseconds. Why is the federal judiciary of the United States divided into circuits? Would salt mines, lakes or flats be reasonably found in high, snowy elevations? I am trying to override the default SqlConnection timeout of 15 seconds and am getting an error saying that the. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. It looks like all the cases that were causing long delays could be resolved much more quickly by attempting a direct socket connection like this: I'm going to use this code to check if the server responds on the SQL Server port, and only attempt to open a connection if it does. Is this an at-all realistic configuration for a DHC-2 Beaver? SQL CPU High - SqlConnection not being closed - Related? Something can be done or not a fit? Asking for help, clarification, or responding to other answers. The default value is 15 seconds. To learn more, see our tips on writing great answers. When instance is create you don't change this value. A value of 0 indicates no limit, and should be avoided in a ConnectionString because an attempt to connect waits indefinitely. CGAC2022 Day 10: Help Santa sort presents! Admittedly, it's a localhost connection which may give different results but it means I can't replicate the problem. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Test to see if Entity Framework is connected to something. What is wrong in this inner product proof? In the case of a wrong ip/host and no sql network connectivity the timer on the SqlConnection doesn't start ticking. A value of 0 indicates no limit, and should be avoided in a ConnectionString because an attempt to connect waits indefinitely. is able to accept enough connections from different clients. By code you can get connection in this way: You can set ConnectionTimeout only you create a instance. - Bacon Bits As Anil implies, ConnectionTimeout may not be what you need; it controls how long the ADO driver will wait when establishing a new connection. You can set the amount of time a connection waits to time out by using the Connect Timeout or Connection Timeout keywords in the connection string. A new connection is created that tries to INSERT in the same table, and gets another lock as the table is already locked. Really? The line of code the poster lists specifically tries to set SqlConnection.ConnectionTimeout. I wonder if I would get different results simply trying to open port 1433 directly. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. CommandTimeout changes the timeout period for the particular query. Do non-Segwit nodes reject Segwit transactions with invalid signature? Is this an at-all realistic configuration for a DHC-2 Beaver? To learn more, see our tips on writing great answers. How to make SqlConnection timeout more quickly. I want the SqlConnection.Open to fail more quickly. The following example creates a SqlConnection and sets the Connection Timeout to 30 seconds in the connection string. When the Data Source (server DNS) in a SQL Server connection string is a DNS name that can't resolve, opening the SqlConnection takes the entire Connection Timeout to throw an exception.. You can set the amount of time a connection waits to time out by using the Connect Timeout or Connection Timeout keywords in the connection string. Only from the callstack, we cannot say for sure where the root cause is. command.CommandTimeout is used for individual searches, updates, etc. Why is the eastern United States green if the wind moves from west to east? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Dapper QueryFirst Too slow if no connection, Disposing SqlConnection from a base DAL class when calling ExecuteReader. You can use a. I'm hitting a very odd pattern here. Is there a good method for tracking this down further? https://improve.dk/controlling-sqlconnection-timeouts/. I feel like it's cleaner to close a socket than abort a thread: Update 2 I get similar results when I try telnet host 1433 from a command prompt. The timeout period elapsed during the post-login phase. rev2022.12.11.43106. The Command Timeout and the Connection Timeout are two different things. Asynchronously wait for Task to complete with timeout. If I try to go to a server that exists, but doesn't allow 1433, it hangs for 30 seconds. C# .NET - Timeout in SqlConnection.Open() - Asked By Jairo on 16-Jun-10 07:43 PM. More info about Internet Explorer and Microsoft Edge. If it was true, then any transaction that lasts longer than the connection timeout of 15 seconds would fail. How do I set the SqlConnection.Open Timeout Scott Simons I am trying to set a timeout on opening connections. ConnectionTimeout impacts timeout when attempting to connect. Find centralized, trusted content and collaborate around the technologies you use most. Why does Cauchy's equation for refractive index contain only even power terms? If you want to provide a timeout for a particular query, then CommandTimeout is the way forward. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Why this would happen is unclear (default pool size to small, forgot to close a sql connection/sql reader). If he had met some scary fish, he would immediately return to the surface. It seems to work when I try to connect to a non-existent server. Better way to check if an element only exists in one array. Those would eventually trigger a TCP timeout. Now keeping the specifics apart, we got: System.Data.SqlClient.SqlException: Connection Timeout Expired. Visit Microsoft Q&A to post new questions. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? How do I fix the error 'Named Pipes Provider, error 40 - Could not open a connection to' SQL Server'? Some information relates to prerelease product that may be substantially modified before its released. Yes, this is an absolutely insane design decision." The code opens the connection and displays the ConnectionTimeout property in the console window. Yes, this is an absolutely insane design decision. . Does integrating PDOS give total charge of a system? If you want to find the number of active users, you can use the services API, or the relevant option in your favorite administration tool (Database -> Advanced -> Show Connected Users in Flamerobin). SqlConnection is used together with SqlDataAdapter and SqlCommand to increase performance when connecting to a Microsoft SQL Server database. From this point the timer is already running. I would like to recommend you check the server side as well, to see whether the database server The question's error message shows a value of 15, and the question specifically says SqlConnection, not SqlCommand. How do I create an Excel (.XLS and .XLSX) file in C# without installing Microsoft Office? Old post but as it comes up for what I was searching for I thought I'd add some information to this topic. Zorn's lemma: old friend or historical relic? Gets the time to wait while trying to establish a connection before terminating the attempt and generating an error. Microsoft makes no warranties, express or implied, with respect to the information provided here. But this only the automated attempts, when the user enter the ip the timeout works great (same connection string except by the IP) . Started reading an excellent book by Redgate Books: Performance Tuning with Sql Server Dynamic Management Views (Davidson & Ford). Ultimately, all resources will be cleaned up when the application terminates so you won't leave any connections hanging. I thought (based on others' experience) that there would be a 30 second delay even at this level, but I get a message that the machine "actively refused the connection" on these right away. More info about Internet Explorer and Microsoft Edge. Youll be auto redirected in 1 second. the stack below was called from a u/i thread which subsequently hung the application due to OpenAsync() doing synchronous network i/o rather than awaiting. Exceptions will be propagated via the returned Task. You could always add it to your Connection String: You can also use the SqlConnectionStringBuilder, You can add Connection Timeout=180; to your connection string. The exception information is still too general for us to find out the root cause. The problem is the instance that i create for the SQL Connection ignores the timeout value specified in the connection string. TransactionScope automatically escalating to MSDTC on some machines? Ready to optimize your JavaScript with Rust? The timeout period elapsed prior to obtaining a connection from the pool. How can you know the sky Rose saw when the Titanic sunk? The property is read-only after connection. It's starting to make sense now. How do I UPDATE from a SELECT in SQL Server? @m0g I don't understand why this isn't the accepted answer. Were sorry. I have seen it when attempting to contact a server where the Windows 2008 firewall is blocking SQL Server, though. It may have come down to us not having enough Workers within SQL to handle the connection request which resulted in a Timeout after the default timeout which is 15 seconds. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The servers that are not turned on take 30 seconds to fail. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. But SQL Server is still holding the lock with WAITFOR on active connection. We are running SQL 2008 R2. Disconnect vertical tab connector from PCB, QGIS Atlas print composer - Several raster in the same layout, Books that explain fundamental chess concepts. Something like this: I've just tested this on my own computer using this code: and it obeys the Connection Timeout value in the connection string. Is it appropriate to ignore emails from a student asking obvious questions? Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? rev2022.12.11.43106. Where does the idea of selling dragon parts come from? Why was USB 1.0 incredibly slow even for its time? The timeout seems to work when I connect to my local system with SQL Server stopped. at System.Data.SqlClient.SqlConnection.Open () Here is an example of our connect string: server=myserver;database=MyDB;Application Name=API;integrated security=SSPI;persist security info=False;Trusted_Connection=Yes; I suspect that we may have forgotten exhausted the connection pool. .SqlConnection.TryOpen(TaskCompletionSource`1 retry, SqlConnectionOverrides overrides) at Microsoft.Data.SqlClient.SqlConnection.Open(SqlConnectionOverrides overrides) at Microsoft.Data.SqlClient.SqlConnection.Open() at . The question's error message shows a value of 15, and the question specifically says SqlConnection, not SqlCommand. The Command Timeout and the Connection Timeout are two different things. I am using an SQL connection string with SqlClient.SqlConnection and specifying Connection Timeout=5 in the string, but it still waits 30 seconds before returning failure. Edit: Here's the updated code. The question here probably is very clearly about the Connection Timeout, which defaults to 15, and is a read-only property of an SqlConnection that must be defined in the Connection String. Furthermore, this timeout does not account for loss of connection because of situation like a dead or overloaded server. So, if you are running into a timeout on commit or rollback you'll need to increase this value through the connection string. SQL Connection Not Timing Out Quickly When Network Cable Unplugged. Basically, you either set Connect Timeout in the connection string like this: Or you set ConnectionTimeout on the command object like this: Be aware that the timeout time is in seconds. protected int gettotalcount () { sqlconnection connection = new sqlconnection (getconnectionstring ()); datatable dt = new datatable (); try { connection.open (); string sqlstatement = "select * from tblcontact"; sqlcommand sqlcmd = new sqlcommand (sqlstatement, connection); sqldataadapter sqlda = new sqldataadapter (sqlcmd); My application is through CLI, and I like adding to the connection string. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Irreducible representations of a product of two groups. SqlConnection.Open Method (System.Data.SqlClient) Opens a database connection with the property settings specified by the ConnectionString. Thanks for contributing an answer to Stack Overflow! What is a NullReferenceException, and how do I fix it? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. when connection.Open(); is called. Evidently the connection timeout is where the ip/hostname is responding on the sql services port but is too busy to service the new connection. Thanks for contributing an answer to Stack Overflow! Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. set conn=Server.CreateObject("ADODB.Connection") conn.ConnectionString="Provider=Microsoft.Jet.OLEDB.4.0" conn.ConnectionTimeout=30 conn.open server.mappath("database . It's basically an instantaneous command that should return immediately, since it's just signaling the server to commit or roll back. Making statements based on opinion; back them up with references or personal experience. I'm on a fast local network and don't want to wait 30 seconds. http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectiontimeout.aspx, https://improve.dk/controlling-sqlconnection-timeouts/. Now, if you mean it used as the timeout for submitting just the commit or rollback command by itself, then no that's not an insane decision. Thanks. When would I give a checkpoint to my D&D party that they can return to if they die? If I try to go to a non-existent server, it times out after a couple seconds. See the blogpost for a nice extension example to handle that too. SqlConnection.ConnectionTimeout is what you want, @GBK You can set the timeout on the connection string then. I noticed this problem during the Azure DNS outage on May 2, 2019. Save wifi networks and passwords to recover them after reinstall OS. SqlCommand.ExecuteReader Method (Microsoft.Data.SqlClient) The code opens the connection and displays the ConnectionTimeout property in the console window. In these circumstances, SQL Azure will close an already established connection: Why do we use perturbative series if they don't converge? See other responses for discussion. TargetSite: System.Data.ProviderBase.DbConnectionInternal GetConnection(System.Data.Common.DbConnection), StackTrace: at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject), at CT.iMagio2.Dal.Documents.Impl.DocumentDal.GetSearch(Int32 searchId). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why is there an extra peak in the Lomb-Scargle periodogram? These debugging instructions are based on a 64-bit dump. Is it safe/clean to just abort a thread like that? A value of 0 indicates no limit, and should be avoided in a ConnectionString because an attempt to connect waits indefinitely. The timeout period elapsed prior to completion of the operation or the server is not responding. I would recommend you close the connection once you have finished using it. Your usage seems to indicate a need to wait longer than normal for a particular SQL query to execute, and in that case Anil is exactly right; use CommandTimeout (which is R/W) to change the expected completion time for an individual SqlCommand. I was going to add a comment but I don't have enough rep. connection.ConnectionTimeout is used for the initial connection. The Command Timeout defaults to 30, and is a read/write parameter of the SqlCommand, a completely different object. I'm not sure what the pattern is, but I don't see the problem when connecting locally with SQL Server stopped, and I don't see it when attempting to connect to a non-existent server. Please note that this only works on SuperServer, Classic would only return one user. Edit: And if the machine doesn't exist, it tells me that right away too. :) It's very helpful! The following example creates a SqlConnection and sets the Connection Timeout to 30 seconds in the connection string. Add some valuable tips and some source code to help clarify your answer if necessary. Set the of CommandTimeout property to SqlCommand, I found an excellent blogpost on this subject: Does your app throw any Sql related exceptions? How do I get a consistent byte representation of strings in C# without manually specifying an encoding? You can read more at http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectiontimeout.aspx. I have tried using the connection timeout setting in the connection string and it doesn't seem to affect the timeout of the open method on the SqlConnection object. System.Data.SqlClient.SqlConnectionPoolManager.Get PooledConnection (SqlConnectionString options, Boolean& isInTransaction) +396 System.Data.SqlClient.SqlConnection.Open () +384 But it doesn't seem to work when I try to connect to a server that exists, but has the firewall blocking SQL and/or doesn't have SQL Server installed. The default value is 15 seconds. SQL Server: "CREATE DATABASE" query timeout, SqlConnection Doesn't Honor Timeout for IP Address Data Sources (.NET Core 2.2), Exchange operator with position and momentum. You can set the amount of time a connection waits to time out by using the ConnectTimeout or Connection Timeout keywords in the connection string. The default value is 15 seconds." Thats only used when you call SqlConnection.Open (). No 30-second delays that I can find. With a client/server database system, it is equivalent to a network connection to the server. This may have occurred because all pooled connections were in use and max pool size was reached.] @BaconBits what the question poster described and asked versus what he wants is different therefore the accepted answer is something different. The timeout period elapsed prior . The following example creates a SqlConnection and sets the Connection Timeout to 30 seconds in the connection string. Min Pool Size- initial number of connections that will be added to the pool upon its creation. Would like to stay longer than 90 days. Making statements based on opinion; back them up with references or personal experience. Edit: Machines that were on the network but are not turned off still take 30 seconds to fail I guess. The Command Timeout defaults to 30, and is a read/write parameter of the SqlCommand, a completely different object. I incorrectly thought the ConnectionTimeout property was settable, but it isn't. Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? Thanks, Scott Nov 17 '05 # 1 Follow Post Reply 0 2909 A SqlConnection object represents a unique session to a SQL Server data source. Ready to optimize your JavaScript with Rust? Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. This is just a quick utility program that's going to always run just on this local network. Message: Timeout expired. Besides, please provide us with more information about your app. Connect and share knowledge within a single location that is structured and easy to search. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. feels like looking for a needle in a haystack. The line of code the poster lists specifically tries to set SqlConnection.ConnectionTimeout. In the event log, I sometimes see this error when our various .net web apps try to open a SQL Connection: StackTrace: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection), at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(), at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error), at System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj), at System.Data.SqlClient.TdsParserStateObject.ReadNetworkPacket(), at System.Data.SqlClient.TdsParser.ConsumePreLoginHandshake(Boolean encrypt, Boolean trustServerCert, Boolean& marsCapable), at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity), at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, SqlConnection owningObject), at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, TimeoutTimer timeout), at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, TimeoutTimer timeout, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance), at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance), at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection), at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options), at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject), at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject), at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject), at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection), at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory), at System.Data.SqlClient.SqlConnection.Open(). How can I do an UPDATE statement with JOIN in SQL Server? Not the answer you're looking for? The timeout period elapsed while . Now connection timeout is 10 seconds. Shoulda been read-write, IMO. Dual EU/US Citizen entered EU on US Passport. I'm not certain but I don't think it's "unsafe" to abort the thread. How do I make it give up and return faster? my use case is a sql server reboot during a client request. This was with .NET 4 against SQL Server 2008 R2. Share Improve this answer Follow And when we encountered Query Timeout it read like: System.Data.SqlClient.SqlException: Timeout expired. The content you requested has been removed. Asking for help, clarification, or responding to other answers. Default is 100. Thanks for sharing! Gets the time to wait (in seconds) while trying to establish a connection before terminating the attempt and generating an error. SqlConnection.OpenAsync() has a code path that does synchronous blocking network i/o to the sql server. SqlConnection.ConnectionTimeout is "the time (in seconds) to wait for a connection to open. But unfortunately that just confirms that the only way around this is your solution of aborting the thread still be interested to know how clean/safe that is, though. It The timeout period elapsed prior to completion of the operation or the server is not responding. The time (in seconds) to wait for a connection to open. In connection strings you can specify a timeout, where 0 equals infinite, the default for System.Data.SqlClient.SqlConnection is 15 seconds, and the default for System.Data.SqlClient.SqlCommand is 30 seconds. The cancellation token can be used to request that the operation be abandoned before the connection timeout elapses. Thats only used when you call SqlConnection.Open(). 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