- sql server Error: 18056, Severity: 20, State: 51. 10C
Error: 18056, Severity: 20, State: 51.
The client was unable to reuse a session with SPID 161, which had been reset for connection pooling. The failure ID is 51. This error may have been caused by an earlier operation failing. Check the error logs for failed operations immediately before this error message.