Fluent license server connection issue in batch mode on CentOS HPC cluster

- November 22, 2023 at 8:28 am
  
  Marcelo Precoppe
  Subscriber
  
  Hello,
  I am trying to run a Ansys Fluent simulation at the University HPC cluster but I am facing a license server connection issue when I run the job in batch mode. The HPC runs on CentOS and uses Slurm scheduling. I am using Ansys Fluent 2023R2.
  When I run Ansys Fluent at the head node of the HPC using Fluent GUI instead of batch mode, Fluent can connect to the license server and I am able to run a simulation. However, when I run in batch mode Fluent cannot connect to the license server and gives me this error message. I have checked that the license server is up and running and that ports 1055 and 2335 are not blocked by the firewall. I would appreciate any help or suggestions on how to solve this issue. Thank you.
- November 23, 2023 at 2:21 pm
  
  Federico
  Ansys Employee
  
  Hello Marcelo,
  what is the error message that you get?
- November 23, 2023 at 2:34 pm
  
  Marcelo Precoppe
  Subscriber
  
  Dear Federico,
  Thanks for helping me with this. Basically, when I run on the head node of the HPC there are no issues, but on the other nodes, it cannot connect to the license server.
  I hope the screenshots above allow you to guide us towards a solution.
  Kind regards,
  Marcelo
- November 28, 2023 at 2:27 pm
  
  VG
  Ansys Employee
  
  Please point to the license server with fully qualified domain name. Add this environment variable to all nodes or in the script: ANSYSLMD_LICENSE_FILE=1055@me-lc6.gre.ac.uk