Connection problems with SQL Server in ASP.NET applications using out-of-process session state

Question

I have several ASP.NET applications deployed in a farm of 4 Windows 2003 machines. Each application uses a separate App Pool and Virtual Directory in IIS. They rely heavily

Answer 1

Transport level errors are often linked to the connection to sql server being broken ... usually network.

Timeout Expired is usually thrown when a sql query takes too long to run.

So I would troubleshoot the link to your Sql Server and then monitor to see what queries are timing out.

Sounds like a SQL job is running, backup? That might be locking tables or restarting the service.