Using the DAC (Dedicated Admin Connection) in SQL Server

From Kendra’s blog:

There’s always a catch. You many need to get firewall ports opened as well, depending on your environment and where you intend to connect from. This will probably be port 1434, but that will vary depending on your configuration. (Books Online has got your back: read more in the “DAC Port” section here.)

How to tell who is using the DAC if you cannot log in with it:

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