Fails to connect to the second server within the same network but different host machine

[Lodimup]

I started two servers using docker compose, each in different VMs in Proxmox.
The second one was the clone of the first.
Whenever two instances of the game start even fresh one vs old ones, the second one cannot be connected. We get "Authentication Failed"

We just want to migrate our stuff from server A to B, I just thought this is weird.

[Micke90s]

Unfortunately, I am not able to reproduce this problem. Do you connect from the same network or from outside?
It would be possible that some type of NAT (Network Address Translation) of Proxmox could cause problems if the same port is used more than once. (This may happen only if IPv4 is used. I think IPv6 should work)

You could try to change the network settings within Proxmox (is there something like bridged network?) or you could try to use the env parameters SERVER_IP and SERVER_PORT.