IPv6 Hosting is not working correctly

[Spikeone]

I've encountered that problem several times, currently it's not possible to host using IPv6, using IPv4 is working just fine.

<<< NMS_LOBBY_PLAYERLIST(3)
    0: 9820 riguele v20230814 - e37a322
    1: 194 Spike v20230814 - e37a322
    2: 9821 rufus v20230814 - e37a322
<<< NMS_LOBBY_CHAT(SYSTEM, riguele created server rigueles Spiel)
(19:00:15) <SYSTEM>: riguele created server rigueles Spiel
<<< NMS_LOBBY_PLAYERLIST(2)
    0: 194 Spike v20230814 - e37a322
    1: 9821 rufus v20230814 - e37a322
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629385 rigueles Spiel 2003:c0:9704:6200:9d6f:15b0:c390:4b87:3665 v20230814 - e37a322 0 Golden Cookies v2 0 6
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629385 rigueles Spiel 2003:c0:9704:6200:9d6f:15b0:c390:4b87:3665 v20230814 - e37a322 0 Golden Cookies v2 1 6
>>> NMS_LOBBY_SERVERLIST
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629385 rigueles Spiel 2003:c0:9704:6200:9d6f:15b0:c390:4b87:3665 v20230814 - e37a322 106 Golden Cookies v2 1 6
GameClient::Connect: ERROR: Connect failed!
>>> NMS_LOBBY_SERVERLIST
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629385 rigueles Spiel 2003:c0:9704:6200:9d6f:15b0:c390:4b87:3665 v20230814 - e37a322 134 Golden Cookies v2 1 6
<<< NMS_LOBBY_SERVERLIST(0)
<<< NMS_LOBBY_CHAT(SYSTEM, riguele is back)
(19:00:24) <SYSTEM>: riguele is back
<<< NMS_LOBBY_PLAYERLIST(3)
    0: 9820 riguele v20230814 - e37a322
    1: 194 Spike v20230814 - e37a322
    2: 9821 rufus v20230814 - e37a322
<<< NMS_LOBBY_PLAYERLIST(2)
    0: 194 Spike v20230814 - e37a322
    1: 9821 rufus v20230814 - e37a322
>>> NMS_LOBBY_SERVERLIST
<<< NMS_LOBBY_SERVERLIST(0)
<<< NMS_LOBBY_PLAYERLIST(2)
    0: 194 Spike v20230814 - e37a322
    1: 9821 rufus v20230814 - e37a322
Connection to 5.9.167.129:3664
Successfully connected to lobby.rttr.info:3664
<<< NMS_LOBBY_ID(7)
>>> NMS_LOBBY_LOGIN(4278192127, Spike, ********, v20230814 - e37a322)
<<< NMS_LOBBY_LOGIN_DONE(f**1@g****e)
>>> NMS_LOBBY_SERVERLIST
>>> NMS_LOBBY_PLAYERLIST
<<< NMS_LOBBY_CHAT(SYSTEM, Spike joined)
(19:00:38) <SYSTEM>: Spike joined
<<< NMS_LOBBY_PLAYERLIST(3)
    0: 9821 rufus v20230814 - e37a322
    1: 9820 riguele v20230814 - e37a322
    2: 194 Spike v20230814 - e37a322
<<< NMS_LOBBY_SERVERLIST(0)
<<< NMS_LOBBY_PLAYERLIST(3)
    0: 9821 rufus v20230814 - e37a322
    1: 9820 riguele v20230814 - e37a322
    2: 194 Spike v20230814 - e37a322
>>> NMS_LOBBY_SERVERLIST
<<< NMS_LOBBY_SERVERLIST(0)
<<< NMS_LOBBY_CHAT(SYSTEM, riguele created server rigueles Spiel)
<<< NMS_LOBBY_PLAYERLIST(2)
    0: 9821 rufus v20230814 - e37a322
    1: 194 Spike v20230814 - e37a322
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629386 rigueles Spiel 217.89.11.67:3665 v20230814 - e37a322 0 Downstairs 0 5
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629386 rigueles Spiel 217.89.11.67:3665 v20230814 - e37a322 0 Downstairs 1 5
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629386 rigueles Spiel 217.89.11.67:3665 v20230814 - e37a322 65 Downstairs 2 5
<<< NMS_LOBBY_PLAYERLIST(1)
    0: 194 Spike v20230814 - e37a322
>>> NMS_LOBBY_SERVERLIST
>>> NMS_LOBBY_PLAYERLIST
<<< NMS_LOBBY_SERVERLIST(1)
    0: 629386 rigueles Spiel 217.89.11.67:3665 v20230814 - e37a322 132 Downstairs 2 5
<<< NMS_LOBBY_PLAYERLIST(1)
    0: 194 Spike v20230814 - e37a322
Connection to 217.89.11.67:3665
Successfully connected to 217.89.11.67:3665