TSQL to find if server is listening on dynamic or static port

Question

Using TSQL, how can I find if the MS SQL server (any version) is configured to use static port or is it using dynamic port?

Script i am trying to use:

DECLARE @TcpPort VARCHAR(5)
        ,@RegKey VARCHAR(100)

IF @@SERVICENAME !='MSSQLSERVER'
    BEGIN
        SET @RegKey = 'SOFTWARE\Microsoft\Microsoft SQL Server\' + @@SERVICENAME + '\MSSQLServer\SuperSocketNetLib\Tcp\IPAll'
    END
    ELSE
    BEGIN
        SET @RegKey = 'SOFTWARE\MICROSOFT\MSSQLSERVER\MSSQLSERVER\SUPERSOCKETNETLIB\TCP\IPAll'
    END

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

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

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

Mark Storey-Smith · Accepted Answer · 2011-10-18T14:25:00.450

You can determine which port an instance is using from the error log but not whether its static or dynamic.

EXEC xp_readerrorlog 1, 1, 'Server is listening'

Alternative would be to read from the registry via xp_regread.

DECLARE 
    @StaticPort NVARCHAR(512)
    , @DynamicPort NVARCHAR(512)

EXEC xp_regread
    'HKEY_LOCAL_MACHINE'
    , 'SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.1\MSSQLServer\SuperSocketNetLib\Tcp\IPAll'
    , 'TcpPort'
    , @StaticPort OUTPUT

EXEC xp_regread
    'HKEY_LOCAL_MACHINE'
    , 'SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.1\MSSQLServer\SuperSocketNetLib\Tcp\IPAll'
    , 'TcpDynamicPorts'
    , @DynamicPort OUTPUT

SELECT
    @StaticPort AS StaticPort
    , @DynamicPort AS DynamicPort

garik · Answer 2 · 2011-10-16T23:59:19.817

2

I think, it is possible (theoretically):

Write CLR stored procedure (use .NET to read specific data from Windows registry)
Use static, dynamic port allocation what and how to read from registry
Grant all rights to execute this.

edited Oct 16 '11 at 23:59

answered Oct 16 '11 at 23:49

garik

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score 1 · Answer 3 · answered Jun 13 '18 at 12:21

another way to find which port sql server is using is through the DMV called sys.dm_exec_connections as per the script below.

--===============================
-- sys.dm_exec_connections
--===============================
SELECT 
[user]=suser_sname()
,local_tcp_port
,session_id
,connect_time
,net_transport
,protocol_type
,encrypt_option
,auth_scheme
,last_read
,last_write

FROM   sys.dm_exec_connections
WHERE  session_id = @@SPID
GO

TSQL to find if server is listening on dynamic or static port

3 Answers3

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