Question

list established tcp connections on remote server

Asked by: dpatel_team

Hi All.

I'm making a small administration application and given a server name / IP address, I would like to tell whether the remote server has established a connection on a given port.
Is there any programmatic way of doing this?
I don't mind running a remote netstat command with some params and pars the answer back on the administration server.
I'm using C# on a Windows Server 2003 with latest of everything...
Here's an example of what I'm looking for:
> myapp.exe remoteServerNmae 2048 [ENTER]
would return a list of all established TCP connections on "remoteServerName" where the listening port on that server is 2048.

Hope this is clear enough. I would be happy to answer any questions you might have regarding this subject.

Thanks!

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Asked On
2009-08-23 at 06:45:59ID24674628
Topics

Internet Protocols

,

Microsoft Visual C#.Net

Participating Experts
2
Points
125
Comments
5

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Answers

 

by: gtworekPosted on 2009-08-23 at 06:53:38ID: 25162639

There's no WinAPI for querying this. You have to run own process on the remote machine or ask via WMI.

 

by: dpatel_teamPosted on 2009-08-23 at 07:16:33ID: 25162703

Ok, so I'm kinda new to WMI.
Can you show some examples? I don't know where to begin with this WMI...

Thanks!

 

by: gtworekPosted on 2009-08-23 at 07:32:00ID: 25162748

start with http://www.microsoft.com/technet/scriptcenter/resources/wmifaq.mspx and http://msdn.microsoft.com/en-us/library/aa394582(VS.85).aspx

But I cannot find how to access netstat data via WMI... Not sure it's possible, sorry but I'm still searching.
If it is really impossible - you have to run own process on the remote machine, read open ports and send the data to your app.

 

by: dpatel_teamPosted on 2009-08-23 at 14:38:22ID: 31619357

decided to follow a different path of soltion

 

by: QlemoPosted on 2009-08-24 at 13:51:48ID: 25172501

If you would not mind using external tools, a combination of psexec and tcpvcon (both free, from www.sysinternals.com) would do:

psexec \\remoteserver -u login -p pwd \\server\uts\tcpvcon -cn | findstr /R "\<2048\>"

The "\<2048\>" will search for a complete word, so you get no line for 12048 or 20481.


20120131-EE-VQP-002

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