SQL Server listens for the DAC on TCP port 1434 if available or a TCP port dynamically assigned upon Database Engine startup.

The DAC port is assigned dynamically by SQL Server during startup.

Koen Verbeeck (6/12/2012)

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Nice question.

The MSDN article Using a Dedicated Administrator Connection says the following:



and



Which makes me assume that the DAC port is another port than the SQL Server port? Or am I reading this wrong?

Koen Verbeeck (6/13/2012)

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So it can be different, but there is no indication that it will be?
So there is a chance DAC will succeed for the default instance as it tries port 1434 first before consulting the SQL Server Browser?

SQLDBA360 (6/13/2012)

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Couldn't the administrator initiate the DAC with a specific port number?

Edit: agree with the earlier comments from Koen good question

sqlcmd -S myServer -U sa -P myPassword –A 

Koen Verbeeck (6/13/2012)

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Good remark. The admin could have specified the non-default port and the connection would have succeeded. The question doesn't specify an explicit statement, so it's up to us to decide how good the admin is in his job

If the question stated this as the statement the admin executed, the question would have been 100% correct as no port is specified:

sqlcmd -S myServer -U sa -P myPassword –A