Thursday, June 18, 2009

TCP Port of SQL Server

By default the default TCP Port for SQL Server is 1433.  It can be changed for security purpose to minimize the potential threat of a hacker trying to access through the default port number.  But that is whole together a different story.

Every now and then somebody posts this question on forums- how can I tell what port my SQL Server instance is running on?  As sometimes while accessing SQL Server remotely you may need to add the TCP Port in the connection string.

There are more than 1 way to find out the answer.  From SQL Server Error Logs, Configuration Manager, Command Prompt, Registry Editor.   But today I will share a simple T-SQL script with you, from which you can easily find out the TCP port SQL Server instance is running on.

First lets see in regedit where to look for the Port number. 
The location of port number for SQL Server 2005 -

For default instance : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer\MSSQLServer\SuperSocketNetLib\TCP

For Named Instance :
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\ [Instance Name]\MSSQLServer\SuperSocketNetLib\Tcp

If you don’t know how to open the regedit :
1. Click on Start and then on Run.
2. In run type regedit and click on Ok.

After checking out the port number manually now lets see the query I created.  It uses a non-documented extended stored procedure xp_regread.  Basically it is helpful in reading from the registry via Transact-SQL.  Since it is a non-documented extended stored procedure you won’t find any reference about xp_regread in Books Online. If you want to know more about it, best thing you can do is Google for xp_regread.  So here is the script which will give you the TCP port SQL Server is running on :

        ,@RegKey VARCHAR(100)

        SET @RegKey = 'SOFTWARE\Microsoft\Microsoft SQL Server\' + @@SERVICENAME + '\MSSQLServer\SuperSocketNetLib\Tcp'


EXEC master..xp_regread
    @rootkey = 'HKEY_LOCAL_MACHINE'
    ,@key = @RegKey
    ,@value_name = 'TcpPort'
    ,@value = @TcpPort OUTPUT

SELECT @TcpPort AS PortNumber
        ,@@SERVERNAME AS ServerName
        ,@@SERVICENAME AS ServiceName

You will get the output something like this :

Port Number

Other simple way of finding out the TCP port is from the Configuration Manager.
1. Start >> All Program >> Microsoft SQL Server 2005 >> Configuration Tools >> SQL Server Configuration Manager .
2. In the configuration manager click on SQL Server 2005 Network Configuration.
3. Then click on the Instance name for which you want to find out the Port Number.
4. Double click on TCP/IP.
5. Finally on IP Addresses, and you will see something like :


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