The most likely explanation is that the port used by the license server (9090) is being blocked by a firewall, either on the server itself or on the network between the client and server.

To check on the server and, if necessary, open the port, you can use the “firewall-cmd” command.

This page gives some examples about how to manage firewalls in servers.

More resources

7th RSC-BMCS AI in chemistry conference

The Chemical Information & Computer Applications Group (CICAG) and Biological & Medicinal Chemistry Sector (BMCS) of the Royal Society of Chemistry are once again organising a conference to present the current advances in AI and machine learning in Chemistry.