The FLUENT application failed to validate the connection
I have been working on a CFD analysis on FLUENT and it has been working fine but all of a sudden FLUENT stopped working due to the following error "The FLUENT application failed to validate the connection". To help identify the right subject matter expert in the support team, I should mention that FLUENT works fine if I launch stand-alone Fluent (Parallel but with zero processes) or the non-GUI Fluent mode. However, when I use multiple CPU cores (e.g., 100 cores), the aforementioned error message appears after a few seconds, and fluent crashes so I must close it via task manager.
I would highly appreciate it if you could help me to fix this issue.