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Port 56731?


Port 56731?

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baguckis
baguckis
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We were having an issue where SSMS was unable to connect to a named instance of SQL Server 2008 R2. We had TCP 1433 and UDP 1434 open.

We allowed all traffic to see what else it was trying to use and found port TCP 56731. When we opened that port it worked... I have never seen this port related to SQL before.

Any clues?
Lynn Pettis
Lynn Pettis
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Named instances use dynamically assigned ports. The browser service normally handles this behind the scenes but the port(s) used still need to be open.

Cool
Lynn Pettis

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baguckis
baguckis
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Thanks for the info!

Is there a range that I can open or do I always need to check what is assigned?


*Note to other readers you can see the port used here:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL10.<InstanceName>\MSSQLServer\
SuperSocketNetLib\TCP\IPAll\
happycat59
happycat59
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By default, SQL Server uses dynamically assigned port numbers. You have the option to assign a specific port number to an instance of SQL Server.

You can do this using the "SQL Server Configuration Manager". Have a look in Books Online for the topic "How to: Configure a Server to Listen on a Specific TCP Port" - it gives you all the details you will need to do this



happycat59
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The port number is also available in the SQL Server log - it is one of the messages logged when SQL Server starts.



baguckis
baguckis
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Excellent. Thank you all for the information.
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