How to adjust firewall setting on the server running FlexLM?

[Andrew Orry]

Q: How to adjust firewall setting on the server running FlexLM?

A: FlexLM uses two ports. One for 'lmgrd' (default 27000) and one per vendor daemon. Vendor daemon ports are usually assigned randomly
If you have a firewall running both ports needs to be opened. It is convenient to assign a specific static port for vendor daemon. It can be done by adding 'PORT=<n>' to the VENDOR line of your license file.

Example:

VENDOR molsoftd PORT=27010   # set vendor port to 27010

After these modification you need to restart FlexLM server and open ports 27000 and 27010 in the firewall. 

[Andrew Orry]

The flexlm error message for this issue is usually FlexLM server error - "Operation now in progress” -> vendor daemon blocked by firewall.