A connection was successfully established with the server, but then an error occurred during the login process. (provider: TCP Provider, error: 0 - The semaphore timeout period has expired

What is the solution for below error:

A connection was successfully established with the server, butthen an error occurred during the login process. (provider: TCP Provider, error: 0 - The semaphore timeout period has expired

Is this problem with Network or with sqlserver?

Thanks,

Ron.