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TCP port opener for testing?

Posted on 2013-01-23
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Last Modified: 2013-01-23
I've been looking for a tool I can use to help me test out a communications problem.  I found a cool utility that does what I need but it won't run on Server 2008 R2:

http://download.cnet.com/Local-TCP-Port-Opener/3000-2085_4-10738986.html

Can anyone recommend something similar that would work for me?  I need software to sit on one end of a VPN listening on specific ports so I can scan from the other side and verify that communications are up.
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Expert Comment

by:Rob Williams
ID: 38810882
There is a web based tool that will allow you to test if a port is open to the server from the Internet.  If it might be of some help, visit the following link from the server and test for the port in question:
http://www.canyouseeme.org
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by:First Last
ID: 38810896
Unfortunately that won't help me, this is a private Cisco point-to-point VPN connecting my main site to a DR center.  I have to test and make sure certain ports are open before enabling a new service.
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Qlemo earned 500 total points
ID: 38811357
The classic tool to do that is netcat, which can act both as server and client, and even implement a telnet protocol. One Windows port can be found at http://nmap.org/ncat/ (http://nmap.org/dist/ncat-portable-5.59BETA1.zip).
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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
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Author Comment

by:First Last
ID: 38811397
Hi Qlemo, that looks like it might do the job!  May I ask for some guidance for the syntax?  Basically I want it to listen on certain ports on the exchange server at the DR site then check from the other side if I can reach it.  The documentation indicates to start it with a switch (/l) to listen but I get an error saying the hostname can't be resolved when I try that.  I'd really appreciate an example line of syntax if you could spare the time.  :)
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Author Comment

by:First Last
ID: 38811508
I should have kept reading, it became clear soon enough.  This is exactly what I needed, thank you Qlemo!
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Expert Comment

by:Qlemo
ID: 38811509
  ncat --listen --keep-open --verbose 127.0.0.1 1000
listens to port 1000 on the local machine, and will give some additional info about connections when established.
  echo test | ncat RemoteIp 1000 --send-only --wait 5s
should send text, and then end the connection. If the port is not reachable, it should wait for 5 seconds.
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