ADO Connection Pooling Error: The Client Was Unable To Reuse A Session With ...

Apr 13, 2006

Hello,

We are running SQL2K5 and have a Web server with a family of sites all sharing an identical connection string to enable ADO connection pooling between them. Today for about 20 minutes we had several (all?) connections from one site that uses a specific DB get a connection reuse error which showed in out SQL logs:

DESCRIPTION: The client was unable to reuse a session with SPID #, which had been reset for conection pooling. This error may have been caused by an earlier operation failing. Check the error logs for failed operations immediately before this error message.

We also have SQL Server slowdown and log in problems from other applications that seemed a symptom of this, or some third unknown cause. Note, the # means the run-time spid number was inserted. The misspelling "conection" comes right out of sys.messages (it is not our custom error):

select top 10 * from sys.messages where message_id = 18056

The immediately preceeding error in the SQL Log was always:
Message
Error: 18056, Severity: 20, State: 29.

Where Severity and State vary, but "Error: 18056" is consistent, although I can find no documentation on "Error: 18056" through Google or MSDN.

Also, the "The client was unable to reuse a session ..." error seems not to be referred to anywhere.

In our IIS logs, the matching entries are of the form:

[DBNETLIB][ConnectionRead (recv()).]General network error. Check your network documentation.

and

Invalid connection string attribute


My questions: Does anyone have experience with this error? We have real good history with ADO connection pooling, but can a "bad" connection be pooled, and if so can it be "flushed" or the pool "drained"?

Thank you for anything you have to offer!



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The Client Was Unable To Reuse A Session With SPID XX

May 11, 2007

Hello,



We have a recurring problem with one of our MS SQL Servers (MS SQL Server 2005 SP 1).

The SQL Server serves as a database server for a Web application with approximately 1500 users, the server is dedicated for the DataBase server.



The scenario is that the database servers cpu peaks at 100% and stays there until restart of the SQL Server service.



The error message from the applicatoion log:



Event Type: Error
Event Source: MSSQLSERVER
Event Category: (2)
Event ID: 18056



The client was unable to reuse a session with SPID 94, which had been reset for conection pooling. This error may have been caused by an earlier operation failing. Check the error logs for failed operations immediately before this error message.



SPID varies.



Anybody that knows anything why this error occurs?



Regards

John

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