I have compiled Paraview 5.5.2 with MPI and OSMesa support on a RedHat cluster. Linux and Windows clients are able to connect to the server without issue, but connecting to it from a Mac client causes a crash with this error message.
[day@node994 bin]$ ./pvserver Waiting for client... Connection URL: cs://node994.cm.cluster:11111 Accepting connection(s): node994.cm.cluster:11111 Client connected. ERROR: In /home/day/build/ParaView-v5.5.2/VTK/Parallel/Core/vtkSocketCommunicator.cxx, line 808 vtkSocketCommunicator (0x3ad9100): Could not receive tag. 1 ERROR: In /home/day/build/ParaView-v5.5.2/ParaViewCore/ClientServerCore/Core/vtkTCPNetworkAccessManager.cxx, line 301 vtkTCPNetworkAccessManager (0x2763240): Some error in socket processing. Exiting...
I went back and built 5.5.0 and 5.5.1 as well and have encountered this issue there as well, leading me to believe that this is not a Paraview issue but rather a system-specific configuration one. However, I have been unable to find anything that may be a culprit for such an issue.