Resolved. Inbound UDP is reaching Node 3 directly again, and our external tests are succeeding. If voice chat still does not work for you, please contact support.

Inbound UDP has been reaching Node 3 directly again since this evening, and our external tests are succeeding. We are continuing to monitor the situation.

A temporary workaround is now available for the reported server: voice chat can run through another of our addresses. This does not fix the cause, and inbound UDP from the internet still does not reach Node 3 directly. We are raising this with our network provider. If you are affected, please contact support.

Cause found: UDP packets from the internet currently do not reach Node 3, on any port we tested. Test packets did not reach Node 2 either. The server and its settings are fine, so a different port will not help. This affects features that need inbound UDP, such as Simple Voice Chat. The packets are lost before they reach our server, and we are raising this with our network provider. Playing over TCP (Minecraft Java) is not affected.

We received a report that the Simple Voice Chat mod does not connect on a Minecraft server on Node 3, even with an additional port. We are checking the UDP connection and the settings. As far as we know, the server itself and gameplay are not affected.