I have a SQL 2012 server that is throwing the following error every 5 minutes or so:
Error: 17886, Severity: 20, State: 1.
The server will drop the connection, because the client driver has sent multiple requests while the session is in single-user mode. This error occurs when a client sends a request to reset the connection while there are batches still running in the session, or when the client sends a request while the session is resetting a connection. Please contact the client driver vendor.
I alert on all Sev 20 errors, so I can't just ignore this.
The good news is that I have some leads on how to fix it (seems like a connection string issue):
- At DBA.SE: How to troubleshoot “client driver has sent multiple requests while the session is in single-user mode”
- At SO: Error 17886 – The server will drop the connection
- In MS forums: Event ID: 17886 Source: MSSQLSERVER (MSSQL Server 2008R2)
The bad news is that I have no idea which application is causing the errors!
The server has over 50 databases, from a wide variety of commercial vendors, contractors, or in-house developers. The error contains no details about which spid or login or hostname or database caused the problem.
I've tried looking at active spids (using sp_WhoIsActive
) when the error is occurring, but there is too much activity on the server for anything to stand out (nor do I know what I'm looking for). Same thing with running SQL profiler – without knowing how to filter, I'm just seeing the firehose of data the server handles on an ongoing basis.
I am trying to narrow it down by figuring out which application teams have made recent changes, but that hasn't panned out so far.
Any ideas?
Best Answer
Try to use
to get more details about source clients.
Try filter type
RING_BUFFER_CONNECTIVITY
.