CE> I began to look over it again and noticed something -- I hadn't had a new
 CE> message from FSXnet since September 28th. Turns out, for whatever
 CE> reason, my board wasn't responding to them in whatever way they check,
 CE> nor had any attempts to contact me been successful, and as such I was
 CE> pulled from the network. That was, again, late September. Yeah, I didn't
 CE> notice this until just now!

Right around that date, an IP address changed for the fsxNet hub.  Presumably
the hostnames should still work but if you had an IP in that configuration, that
is probably the issue.

On my system, the hostname is net1.fsxnet.nz:24556

--- Mystic BBS v1.12 A47 2021/12/24 (Linux/64)
 * Origin: Shipwrecks & Shibboleths [San Francisco, CA - USA] (618:300/42)