I'd like to reopen this.

I think it would be easy to add a setting to not do ping-pong and just take an ip/port from the settings, for v4 and v6.

I have set up a server with friends on a machine behind a pf-Sense Firewall and properly configured the NAT with port-forwarding.

When the factorio ...

Thanks for your quick reply. Yes, the signal seems to be an error. Did not notice it. I never use rails bidirectional and it was a misclicked signal. Just wondering why this made it not accept.

In a somewhat advanced game in [0.17.79], no mods, I have a train station which trains cannot find.

(link to savegame included)

When a train stands a few tiles before the station, I can set the target station or make it go there.
When standing anywhere further away from the station, it will ...