Hey there!

I'm running two services in the same project, and I’m trying to connect from one to the other over port 25575 (RCON for a Minecraft server). I understand that internal networking uses IPv6, and DNS resolves correctly to an internal .railway.internal address. However, when I try to connect using a Python socket from the bot container, the connection to that IPv6 address on port 25575 just times out.

From what I can see:

• The target container is listening on tcp6 :::25575 (confirmed via /proc/net/tcp6 and a Python bind test).

• DNS resolution returns a valid IPv6 address.

• Both containers have IPv6 addresses on railnet0.

I just want to confirm:

• Is there anything extra I need to do to allow inter-service IPv6 TCP connections?

• Are there any known restrictions on connecting to other services on custom ports like 25575?

Thanks in advance!