What could be blocking my app server from connecting to my SQL Database

  • I'm not a network guy at all and not the best at SQL to be honest. I'm setting up a new environment with an app server and a database server. I can remote from one to the other, I can ping from one to the other, I am behind an external firewall so I've disabled Windows Firewall on both. I've enabled remote connections on the SQL database, but when I try to connect through Management Studio from the app server to the database via IP or server name (e.g. xxx.xxx.x.x\SQLEXPRESS or servername\SQLEXPRESS I get a server not found or not accessible error. Any thoughts on what might be blocking me still?

  • Can you telnet to the database server from the app server on the port the SQL Server instant is listening on? It's also worth bearing in mind that this is a named instance so will communicate with the SQL Browser service (if it's running) to get the port this instance is listening on, which it does do over UDP port 1434.

  • The SQL Browser Service was off that seems to have been the issue thank you!

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