For anyone following the thread,
After testing with lmtools (FlexNet command line test tools) and sniffing with WireShark (to eliminate a network/firewall problem), I diagnose a licence problem for some features. While present in the licence file Rocky_HPC wasn’t presented by the licence server to client.
Having no clues, I completly reinstall of both client (Ansys Fluent + Rocky) and server (Ansys Licence Server) to 2024R1 just to be sure everything was fine, I still had the problem.
Going to the Ansys Licence Portal ( https://licensing.ansys.com/index.html) regenerating and redownloading the licence file for the server (Last download was in Dec 23) and install the “new” licence file, then the problem was solved.
So while we don’t upgrade/change any of our licencing, the licence file shoud be re-issued and re-installed to work correctly with the 2024R1 Licence Server.
BTW: 4 is the CPU limit in the base Rocky licence without using Rocky_HPC.