Find which port SQL Server is using to establish connections

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Find which port SQL Server is using to establish connections

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SQLDCH

Posted Wednesday, September 7, 2011 11:20 PM

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Comments posted to this topic are about the item Find which port SQL Server is using to establish connections

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Post #1171523

Avinash Barnwal

Posted Wednesday, September 7, 2011 11:21 PM

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The third way doesn't seem to be option to find out which of the port SQL Server is listening, since if you are already connected to the SQL server, then you already know the Port.

Kindest Regards,

Avinash

avin_barnwal@hotmail.com

Post #1171524

spaghettidba

Posted Thursday, September 8, 2011 1:15 AM

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Avinash Barnwal (9/7/2011)

The third way doesn't seem to be option to find out which of the port SQL Server is listening, since if you are already connected to the SQL server, then you already know the Port.

Not completely true. You can connect using a named instance and never know the port you're attaching to.
The SQL Browser service listens on port UDP 1434 and returns the port of the named instances in a datagram. The client application parses the datagram and connects to the port returned by the SQL Browser.

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Post #1171546

Håvard

Posted Thursday, September 8, 2011 1:27 AM

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I really liked this article. It's short and simple, and I learned something Smile

Post #1171550

d.majoor

Posted Thursday, September 8, 2011 2:09 AM

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If you are connected (using the instance name) you can also find it by query (SQl2000 and up):

set nocount on
go

DECLARE @SqlPort Nvarchar(10), @instance_name Nvarchar(30), @reg_key Nvarchar(500), @value_name Nvarchar(20)
if left(CAST(SERVERPROPERTY('ProductVersion')AS sysname),2) = '10'
BEGIN
select @instance_name = CAST(SERVERPROPERTY('instancename')AS sysname)
if @instance_name is NULL
BEGIN
set @reg_key = 'SOFTWARE\Microsoft\MSSQLServer\MSSQlServer\SuperSocketNetLib\Tcp'
END
ELSE BEGIN
set @reg_key = 'SOFTWARE\Microsoft\Microsoft SQL Server\' + @instance_name + '\MSSQLServer\SuperSocketNetLib\Tcp'
END
EXEC master..xp_regread @rootkey='HKEY_LOCAL_MACHINE',
@key=@reg_key, @value_name='TcpPort',
@value=@SqlPort output
select CAST(SERVERPROPERTY('ServerName')AS sysname) as ServerName, @SqlPort as Port
END
if left(CAST(SERVERPROPERTY('ProductVersion')AS sysname),1) = '9'
BEGIN
select @instance_name = CAST(SERVERPROPERTY('instancename')AS sysname)
if @instance_name is NULL
BEGIN
set @reg_key = 'SOFTWARE\Microsoft\MSSQLServer\MSSQlServer\SuperSocketNetLib\Tcp'
END
ELSE BEGIN
set @reg_key = 'SOFTWARE\Microsoft\Microsoft SQL Server\' + @instance_name + '\MSSQLServer\SuperSocketNetLib\Tcp'
END
EXEC master..xp_regread @rootkey='HKEY_LOCAL_MACHINE',
@key=@reg_key, @value_name='TcpPort',
@value=@SqlPort output
select CAST(SERVERPROPERTY('ServerName')AS sysname) as ServerName, @SqlPort as Port
END
if left(CAST(SERVERPROPERTY('ProductVersion')AS sysname),1) = '8'
BEGIN
Create table #Port_2000 (value nvarchar(20),Data nVarchar(10))
insert into #Port_2000 exec master..xp_instance_regread 'HKEY_LOCAL_MACHINE', 'SOFTWARE\Microsoft\MSSQLServer\MSSQLServer\Supersocketnetlib\tcp', 'tcpPort'
select @SqlPort = Data from #Port_2000
select CAST(SERVERPROPERTY('ServerName')AS sysname) as ServerName, @SqlPort as Port
drop table #Port_2000
END

Post #1171567

bertrand.leroy

Posted Thursday, September 8, 2011 2:20 AM

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Thanks for the tips;
For info:
I found out though that the only way that worked for me was to check the event details - although for that I had to restart the server to generate new events.

With regards to the second option, I have no values displayed in that field, or any other fields labeled "Port" in that IP-Addresses tab.

The third option had to be tinkered with a wee bit -
@@SERVICENAME returns MSSS2008R2
but the key is actually found under MSSQL10_50.MSSQLSERVER2008R2

and then, just like for option 2, that tcp key value is empty anyway:
Value Data
tcpPort NULL

thanks again for the tips,

B

Post #1171573

Lawrence Moore

Posted Thursday, September 8, 2011 2:22 AM

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How about using this for a TSQL based solution?:

SELECT DISTINCT(local_tcp_port) FROM sys.dm_exec_connections
WHERE net_transport='TCP'

Post #1171574

Steve Smith-149662

Posted Thursday, September 8, 2011 3:30 AM

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You can also use the following from the command line :

netstat -n -b

You can then check the returned values for the executable you're interested in to see the port (or ports) being listened on.

Post #1171598

mohammed moinudheen

Posted Thursday, September 8, 2011 5:12 AM

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Nice simple article. We could also get this information from SQL Server error log.

Mohammed Moinudheen

Post #1171627

tskelley

Posted Thursday, September 8, 2011 8:21 AM

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Figured I would throw one more method, albeit quite a bit more manual. You can also check the error log in found in the Log folder where your SQL Server is installed (for example, C:\Program Files\Microsoft SQL Server\MSSQL.1\Log). The latest log file will be named ERRORLOG (w/out the numbered extension). Using a standard text editor, like Notepad, you can do a quick search for the text 'listening'.

Post #1171765

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