I have a clustered named instance on SQL Server 2014. I have enabled the DAC Port for emergencies. I want to record this DAC port in our inventory system so that DBAs can connect to it if the SQL Server is behind a firewall. In that instance we will open the firewall to the DAC port. I am a bit nervous about the DAC port changing for some reason. If I set the DAC port in the registry, will it ever change? Is there any way to know that the DAC Port has been manually set?
If the SQL Server is not behind a firewall then we can just connect using -A or Admin: and not worry about it.