Error in connection SAP 2007 B PL 11 client to SQL server

Dear All,

I am using SAP 2007 B PL 11. Whenever i am doing change server on client systems and entering the SQL server name and pwd the system gives error:

Connection failed:

SQLState: '08001'

SQL Server Error: 0

[Microsoft][SQL Native Client]Unable to complete login process due to delay in opening server connection

If i directly punch the IP address of the server then it immediately shows me the company lists. When i select a company and then enter the sap user name (manager) and pwd then it takes almost 3-4 minutes to connect to the company.

Can anybody please help me out on this issue.

Regards,

Rahul