I'm getting a SQL Network error when connecting to Tridion 2013 SP1, but it only appears in the GUI Notification panel and I can't work out why. The funny thing is I had the same error which prevented me from logging in at all, which was down to incorrect credentials in the Tridion Content Manager Configuration MMC. Correcting this, I can now get into the CME GUI, but creating new Pubs, etc just results in the error
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)
What is this likely to be caused by?