I have been running a tor node for 133 days and Im starting to receive some weird messages in the log file. One of them look like this: Received http status code 504 ("Gateway Time-out") from server '154.35.32.5:80' while fetching "/tor/server/d/9169637E422C216BECD05C6CFE3AE..... https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays
Hi Carsten, that is being caused by some ongoing issues with one of the directory authorities (Faravahar). I contacted the authority operator a little while ago and he's presently looking into it.
Cheers! -Damian