When an instance of SQL Server 2005 is under a heavy load, the following error message may be logged in the SQL Server 2005 Errorlog file:
Error: 17187, Severity: 16, State: 1.
SQL Server is not ready to accept new client connections; the connection has been closed. Wait a few minutes before trying again. If you have access to the error log, look for the informational message that indicates that SQL Server is ready before trying to connect again.
Additionally, the following error message may be logged in the Errorlog file:
Error: 17194, Severity: 16, State: 1.
The server was unable to load the SSL provider library needed to log in; the connection has been closed. SSL is used to encrypt either the login sequence or all communications, depending on how the administrator has configured the server. See Books Online for information on this error message: 0x2746.