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How to test if a port is open on a remote server

2792  Troubleshooting

If a connection to an Office Maker or BiblioMaker server fails, you can check whether the port can be reached on the server as follows:

Windows

Start the PowerShell application and enter the following command:

tnc [server address] -port [port number]

Example

tnc cloud3.officemaker.ch -port 19813

 

Alternative : use the PortQryUI application (developped by Microsoft) available here (instructions for use).

 

macOS

Start the Terminal application and enter the following command:

nc -vz [server address] [port number-port number]

Notes

  • Do not use this command to test a port in UDP, as the result will be unreliable.
  • If a port cannot be reached, the test result may take up to 1 minute per port tested. So limit yourself to testing ranges of 2-3 ports at a time.

Examples

nc -vz cloud15.officemaker.ch 19812-19815 (test TCP port range 19812 to 19815)

 

Tests results

If the test result is a failure, this indicates that the port under test cannot be reached for one of the following reasons:

  • The remote server is switched off.
  • The remote server is up, but the application using the port is down.
  • A firewall prevents connection between your workstation and the server.

Web addresses and ports to open for our programs 
How to test if a port is open on a remote server