Sometimes it is desirable for the NetSim license (RLM) server to be behind a firewall.  RLM supports this, but there is a small amount of configuration that you will have to do to use RLM across a firewall.

If  you have a firewall installed on the server node 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#  (Note: the keyword HOST is equivalent to SERVER)
    • ISV isvname
  • 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.

Please see