Problems with connection to the Vray licence server under Mac OS 15

[carsten_strate]

We have recently updated from Mac OS 14.7.3 to 15.3.1. Since then we have the problem that Cinema 4D sporadically gets no connection to the licence server. This manifests itself in the fact that no new Vray materials can be created because Cinema freezes and the following error message appears when trying to render.
Failed to obtain V-Ray licence: 65: The Chaos License Server could not be reached (unreachable host).

We work with the Cinema version 2025 for old projects we still have version 21. If the error occurs in 2025, 21 can still work without errors. But it can also be the other way round or even both may not work.

In most cases, a restart fixes the problem temporarily and the error can occur again at any time. Intel or M processor makes no difference.

The licence server runs on a separate server.

A colleague has not yet updated Mac OS and the error does not occur for him.

The error does not occur when the workstation is working as a render client.


Is this problem known?
Is there a solution?


Hardware and software used:
Intel iMac and MacStudio
Mac OS 15.3.1
Vray licence server 6.2.0
Vray 6.20.04 (version 7 shows the same problem)
Cinema 4D 2025.1.3 and R21.207

[kostadin.botev]

If the license server is on a remote machine then yours is losing connection to it for some reason hence the disruption. Installing the license server locally on your computer should fix that otherwise your IT needs to troubleshoot the connectivity issues.

[carsten_strate]

Thank you for your answer.
I have now installed the licence server locally and am getting a licence again.

But now there is a new problem. Distributed rendering no longer works. When I want to render something with distributed rendering, the following error message appears in the Cinema 4D console: [WARNING] Could not connect to host xxx.xxx.xxx.xxx:20207: Unknown error

But I can ping the render clients and also control them remotely, ssh and other connections also work normally.

And again, the error usually only occurs in Cinema 4D 2025, in version R21 everything works.