SQL Server 2008 DBNETLIB error

Our ASp.net application is getting error as below" [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied "

I can connect with Enterprise manager management studio and Query analyzer without any issue.

It was开发者_高级运维 running these applications with out any issue long time. last one week we are getting this error.If we restart the server .it works then it will come again after 3to 4 hours.

We are running on Windows 2003 server. I was searching and didn't find a solution yet. If anybody knows anything for this error, please post the details to resolve.

Thank you in Advance Joseph

Sounds like you are running out of space on the drive that contains the tempdb. The tempdb is purged on a restart but slowly grows as queries are executed and connections are made. Check the drive when you start having the problem. If you're within a few megabytes of zero, then that's the problem. Clear-up some hard drive space, move the tempdb to another drive, or create multiple tempdb files on multiple drives.

Could also be a problem with RAM, but it's more likely to be an issue with the tempdb.