Over the weekend around 2am in the morning we started receiving the following error from all of our web applications accessing a particular SQL Server:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server).
Unfortunately the error was not caught and it continued all day the next and stopped randomly at 5:15am the following morning. So basically it lasted from Sunday morning at 2am until Monday morning at 5:15am.
Everything looked fine on the SQL Server and Web Servers. There were no updates installed and the SQL Server was up and running with no problems. I've checked the Windows logs on SQL and web servers and there was nothing that looked related. I've checked the items listed in the article below and none of them applied:
As far as I can tell it appears to be completely random. Has anybody ever come across anything like this? I really appreciate any help on this. Thanks.
Gus Jones