I've noticed a weird issue, it may have to do with IPv6 vs IPv4. Nodespy can't connect via IPv6 address, but http can. In my case the main BBS Page is at http://[2601:191:8402:170:ad8:9bc6:910e:3fec]/
but using [2601:191:8402:170:ad8:9bc6:910e:3fec] in nodespy times out every time. I also see this with putty, but maybe using an older putty I'm on a pretty resent A47 (see taglines) so that's not it.
... Error 3032 - Recursion error. See error 3032.
--- Mystic BBS v1.12 A47 2021/08/14 (Raspberry Pi/32)
* Origin: Mystic Pi BBS bcw142.zapto.org:23 (21:1/145)