In my application, I am using VB6 and SQL Server 2000.
While running the application, sometimes the follwing error occurs.

A connection could not be established to the SQL Server
Reason:General Network Error. Check your network Documentation.
Please verify SQL Server is running and check your SQL Server registration properties(by right-clicking on the SQL Server node)
and try again.

The problem is solved by restarting the computer.
What is the reason for this error?

Can anybody help me?