Avg tcp server not updating
After that, any instance on that machine would have to use another port.
In this article I go through the process of configuring Windows Firewall for different scenarios along with the associated considerations.One thing to note is that I mention it uses the IP Address.The reason for this is that when you connect to machines your DNS will direct you to the correct IP based on the machine name you give it, so you are still accessing your SQL Servers by using the machine name Instance Port.You may have one instance running on a default/custom/dynamic port.On the other hand there may be more than one instance on the same machine with a combination of different ports and the SQL Server Browser service may be stopped or running.
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Check the status of the firewall on the General tab and if the firewall is off turn it on to enable it.