See if PRB: SQL Performance Monitor Counters Missing mskb #Q227662 can give you any pointers.

>Once a while, a SQL 6.5 SERVER hangs up. We always to get an error message from EVENT VIEW of Window NT 4 server.
>The error is :
>DB-LIBRARY error - SQL Server connection timed out.
>Source: SQLCTR60
>
>1. What kind problem it is?
>
>2. What is SQLCTR60.DLL doing? In 7.0 and 2000, these files are SQLCTR70.DLL and SQLCTR80.DLL. In BOL I can't find information of these file.
>Where can we find all file description in BINN directory?
>
>Any 7.0 and 2000 experience is helpful.
>
>Thanks
>
>
>Jim