TS3 connection problem

Hello,

i have a fritzbox, ipfire and one LAN connected PC with TS3 Server.
I can connect directly with the TS3 Clint the IP address,
but if i use dyndns i cannot established a connection.

the URL is translated to the external IP address correct, because my OpenVPN works.
I guess the PortForward Settings are not correct, can someone help?

fritzbox setting:
Bezeichnung: myTeamSpeak
Protokoll: UDP
IP-Adresse im Internet: correct external IP
Port extern vergeben 9987

ipfire firewall rule:
1 UDP RED Firewall: 9987->192.168.1.5: 9987

Try UDP Any Firewall: 9987->192.168.1.5: 9987

funny, after 2 hours trying it works with the setting:
1 UDP RED Firewall: 9987->192.168.1.5: 9987

today both UDP RED Firewall: 9987->192.168.1.5: 9987 and UDP Any Firewall: 9987->192.168.1.5: 9987 does not work :frowning:

the problem is not the dyndns mapping, i tried with the IP from my Internet Provider

in the firewall log:
|Time |Chain|Iface|Proto|Source Destination |Src Port Dst Port|
|11:02:09|DNAT|red0 |UDP|[www.xxx.yyy.zzz][192.168.2.2]|49349 9987|

DNAT for CHAIN is correct, right?