Also, running netcat on the compute node to contact the license server’s port 1055 succeeded:

   nc -zv licenseServerIpAddr 1055
   Ncat: Connected to licenseServerIpAddr:1055.
   Ncat: 0 bytes sent, 0 bytes received in 0.02 seconds.

The license server runs on Windows, and the administrator double checked to see that there are no firewalls to block the connection. Other Windows clients work in checking out the license. Our clients/compute nodes differ from those other clients because the compute nodes run CentOS 7.6.

Any ideas? Could it be a version difference issue? I’m puzzled because it seems like the network tests show full connectivity.

Thank you in advance.