REPLY: 2:335/364.3 50f8c7d1
MSGID: 2:280/464.47@fidonet 5de6e18a
PID: GED+LNX 1.1.5-b20180707
CHRS: UTF-8 4
TZUTC: 0100
TID: CrashMail II/Linux 1.7
 FB> Jamnntpd server 1.0 doesn't accept the connection if this is on IPv6,
 FB> any hint? :)

1.0? That version is 15 years old. The latest version is 1.3.

Unfortunately it doesn't look like 1.3 has IPv6 support. Just run a TCP
reverse proxy in front of it, like nginx, haproxy, stunnel, ...

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