Oli wrote (2021-09-16):

 Ol>>> Looks like binkd has problems parsing some IPv6 addresses
 Ol>>> correctly:

 Ol>>> + 15 Sep 19:41:40 [5273] call to 2000:1/1@fakenet
 Ol>>>   15 Sep 19:46:48 [5290] trying fd12:3456::1 [fd12:3456::1]...
 Ol>>> ? 15 Sep 19:46:48 [5290] connection to 2000:1/1@fakenet failed:
 Ol>>> Invalid argument

 MvdV>> Here I have no problem with ULA addresses:

 MvdV>> Note: I have the literal address in the config, no DNS incolved.
 MvdV>> So the problem may be in the DNS server.

 O> I also use the literal IPv6 address. I just tried it on another machine
 O> with 64-bit Linux and I cannot reproduce the problem there. Interesting.
 O> Maybe specific to 32-bit (or armv7 / Raspberry)?

Correction: the IPv6 over Socks5 problem is the same on the 64-bit machine.