Reference:  http://www.reprisesoftware.com/blog/2012/10/using-rlm-across-a-firewall/ 


If  you have a firewall installed on the server side which is not allowing your application to access either the rlm port, or the port of the ISV server you must first configure your firewall to allow access to both the main rlm port, as well as the ISV server port.  To do this, perform the following steps:

  • In your license file, look at the SERVER (or HOST) and ISV lines:

           SERVER   server-hostname   server-hostid   main-rlm-server-port#  

           ISV isvname

           (Note: the keyword HOST is equivalent to SERVER)

  • Add the desired port # to the ISV line as follows:

           ISV   isvname   port=isv-port#     (if you have RLM v9.0 or later), or

           ISV   isvname   isv-binary   isv-options-file   isv-port#    (if you have pre-v9 RLM)

  • Next, configure your firewall to allow access to both isv-port# and main-rlm-server-port#
  • Make sure that the license file is updated on the server node, and that the client nodes know how to find rlm – either with a license file with the SERVER line above, or by setting the RLM_LICENSE environment variable  to  main-rlm-server-port#@server-hostname
  • Re-start rlm – you must restart RLM in order for any port changes to take effect.  Restarting the ISV server via the web interface or rlmreread does not restart RLM.


Configure your firewall to allow access to the following ports 
1. Web-server-port# - 5054 for admin access the license portal
2. main-rlm-server-port# - 5053 
3. isv-port#  - for ISV (TETCOS) License server. We recommend you use Port no 5052.  The license file needs to edited based on the port number chosen. Add the desired port # to the ISV line as follows
ISV   isvname   port=isv-port#     (if you have RLM v9.0 or later),


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Setup of VPN connectivity to server to run NetSim from home?

How to restrict access to the NetSim license server web interface?