hehe, so … if you ever change the hostname of a Linux machine, you really really ought to double-check /etc/hosts to make the same hostname change there
it’s surprising just how much will break if a machine’s own hostname isn’t resolvable to a 127.x.x.x address :P
It’s always been wild to me how the seemingly-simplest change (“what is the name of this computer” has so many little gotchas and quirks.