I just tried logging in and found that it hangs indefinitely. This seems to be because shhhbb.com has a AAAA record that the BBS isn't listening on:

> debug1: Connecting to shhhbb.com [2a01:4ff:1f0:8a78::] port 2223

If I connect with `ssh 5.78.86.154 -p 2223` instead I get in fine.

Maybe either have the server listen on v6 / adjust the packet filter or stop shhhbb.com resolving its AAAA address, which is currently taking priority for me.