We have a license server at the office and I have Autodesk Sim CFD installed on my laptop; laptop serves as the solver.
Machine is HP Elitebook Workstation with Intel 2.5GHz i7 32GB RAM 220GB SSD.
I am able to run simulations perfectly inside the network firewall but when I VPN and try to run the simulation, the software gets through the meshing process and then provides the message shown in the title. The next day, I can simulate the same model file inside the firewall with no problems.
I have tried everything I can think of short of moving the license server to my laptop (not really an option). While on VPN, I can do everything else network related with no issues. Pinging the server machine works fine over VPN from a command window.
The complexity of the model is not the issue (tried with a simple straight aluminum pipe with water).
I would suggest that the solution here is to use licence borrowing, rather than vpn, which as far as I know, is not supported.
When you are in the office, you should be able to borrow the licence and then use this offsite.