We are using domain name instead of IP in connection string. It may be issue for this type of error:
Unable to complete login process due to delay in opening server connection
We are getting this error suddenly after transfer our SQL Server 2005.
Have a look at:
A successful TCP connection from SqlClient to the server was broken due to a TCP keep-alive heartbeat failure (typically indicating problems with the underlying network infrastructure):
Check your duplex settings of your network cards for the SQL Server as well as the client machine making the connection to make sure that they are configured properly.
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You mean the error doesn’t occur every time and it happens random. Try to enlarge the connect timeout to around 30 seconds. If you want to connect using FQDN as server name, try to turn on File and Printer Sharing and explicitly use named pipe protocol.
If there are any more questions, please let me know.
***Xiao Min Tan***Microsoft Online Community***