Why you have connection timeout error in SQL Server?
If you encounter this error, it generally means that the client has found the server and can attempt to connect, but the connection time exceeds the allowed duration, causing an error. This situation often occurs when a user runs Enterprise Manager on the Internet to register another server that is also on the Internet, and the connection is slow. Sometimes, network issues within a local area network (LAN) can also cause such errors.
How to fix connection timeout error in SQL Server?
To resolve this error, you can modify the client's connection timeout settings. By default, the timeout setting for registering another SQL Server through Enterprise Manager is 4 seconds, while for Query Analyzer, it is 15 seconds (which is why errors are more likely to occur in Enterprise Manager).
Enterprise Manager:
1. In Enterprise Manager, select Tools from the menu, then select Options
2. In the SQL Server Enterprise Manager Properties window that appears, click the Advanced tab
3. In the Connection Settings section, enter a larger number, such as 20, in the Login timeout (seconds) box
Query Analyzer:
1. Go to Tools > Options > Connections
2. Set the login timeout to a larger number and set the connection time out to 0
Testing connection:
1. Ensure you can ping the server
2. In DOS, type telnet <ip> 1433 and make sure there are no errors
3. Connect using the IP address in Enterprise Manager:
In Enterprise Manager, right-click the SQL Server group > select New SQL Server Registration > Follow the wizard, entering the remote instance name (IP or machine name) when prompted
Select SQL Server authentication and enter the login name and password (e.g., sa, pass)
4. If that doesn't work:
On the SQL Server server, go to the Start menu > SQL Server > Server Network Utility
Enable WinSock Proxy, enter the proxy address (SQL Server's IP), and set the proxy port to 1433
5. If it still doesn't work:
On the SQL Server client, go to the Start menu > SQL Server > Client Network Utility
Go to the Alias tab, add a new alias, set the network library to TCP/IP, and enter the server name (remote IP or instance name)
