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Thursday, September 9, 2021

Error Connecting to SQL Server Instances after enabling Windows Firewall

Description:
For security reason, you need to enable the Windows Firewall on your SQL server machine.
However, after you enable them, user cannot connect to one of your SQL Instances. You already create Inbound TCP rule to allow port 1433 and another TCP port where the instance listened, but users still cannot connect. They can connect if the specified the port number for that instance was directly written on the connection page.

Resolution:
Make sure you also create inbound rule for UDP port 1434. The SQL Server browser service runs on UDP port 1434 and listens for incoming connections to a named instance.

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