Port query tool

Overview: This tool will enable you to test if a remote, or local, server/device is correctly listening on a given port. If the port is not listening both remotely (tested from outside of the network, such as from another part of the Internet) and locally (tested from within local network) then the service is not running, or the local device has firewalled itself. If the port is not listening remotely but is listening locally then a firewall or routing issue is the cause. This will help to identify and eliminate the cause of the problem.

  • Download the port querying tool
  • Extract the ZIP file to your Desktop
  • Double-click the file "portqryui.exe" to get started

Click here to download our customized version of Microsof's PortQryUI v2 tool

How to use the tool:

  • Double-click the file "portqryui.exe" the get started (see pic below)
  • Enter the hostname or IP address of the server or device to test (eg. http://www.google.com/)
  • Select the service to test for (eg. Web)
    • Or, manually enter the port number(s) if you know the ports to test for
  • Click "Query" and wait for the results to appear in the lower results window
    • Scroll through the results looking for "result code" (there may be more than one)
    • For each "result code" look at the preceding row above the code
      • If you see LISTENING (eg. "TCP port 80 (http service): LISTENING") then the port is open, reachable, and a service was found to be running on the other end. This is a good result.
      • If you see FILTERED (eg. "TCP port 81 (unknown service): FILTERED") then the port is closed, unreachable and/or a service was not found to be running on the other end. This is usually a bad result, but please note that some ports (like 8008 and 8080 for web) are additional ports and oftne not required for the service to run; carefully scroll though all of the results to see if another port actually was found to be listening.
  • Feel free to send the results (Copy & Paste) to us here at the 123vISP Support Team if you'd like to explain them or want us to escalate a fault for you

Want to get a bit more technical and try some more advanced tools? Check out this article: http://www.microsoft.com/technet/community/columns/cableguy/cg0105.mspx 

Example of the port query tool:

Article ID: 102, Created On: 10/20/2008, Modified: 10/20/2008

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