Factorio Forums

I have been attempting to set up a multiplayer game for the last couple of hours, but I keep getting a "Failed to Determine External IP Address" error. Having looked through the logs, I found that everything was working fine, and it was connecting through the ports until I got this error -

Warning ServerRouter.cpp:492: Received own adddress message reply with conflicting address (got 67.161.150.81:20396, expected 67.161.150.81:23345)
44.869 Warning ServerMultiplayerManager.cpp:551: Determining own address has failed. Best guess: 67.161.150.81:23345

I cannot find anything online about it, and honestly don't know what exactly it means or how to fix it. Any help is appreciated. Thanks

It means, that the two servers used to determine your external IP did not see the same IP when connecting to you.