Hey everyone,

I have kind of an awkward problem with my TS3-Server on a VPS.

Everyone with an IPv6 Adress can connect to it withour any Problems anytime.
But some of my clan members with an IPv4-only-ISP can't connect to the server.
Only when I reboot the whole VPS and then start the TS3-Server manually they can connect. But overnight (or after some hours, we encounter the problem in the evening, restarting the server, and the next evening again...) they can't connect to the server.
I already excluded the Client as error-source. It occurs on all any Client with an IPv4-only.

The server was configured exactly after this (german) manual https://wiki.ubuntuusers.de/TeamSpeak-Server/

The domain is hosted on 1und1.de (and im using their DNS, SRV is set correct!), the server on a different provider with an solo IPv4 and an IPv6 /64 subnet.

Everything works fine for IPv6, but I can't figure out where I made a mistake.
I reinstalled the TS3-Server twice but no change.

ts3server.ini: I bound IPv4 to 0.0.0.0, because I thought maybe there is the problem, bot won't work either way
machine_id=
default_voice_port=4242
voice_ip=0.0.0.0, 2a02:c207:3002:2714:0000:0000:0000:0003
licensepath=
filetransfer_port=30033
filetransfer_ip=0.0.0.0, 2a02:c207:3002:2714:0000:0000:0000:0003
query_port=10011
query_ip=0.0.0.0, 2a02:c207:3002:2714:0000:0000:0000:0003
query_ip_whitelist=query_ip_whitelist.txt
query_ip_blacklist=query_ip_blacklist.txt
dbplugin=ts3db_sqlite3
dbpluginparameter=
dbsqlpath=sql/
dbsqlcreatepath=create_sqlite/
dbconnections=10
logpath=logs
logquerycommands=0
dbclientkeepdays=30
logappend=1
query_skipbruteforcecheck=0
Serverlog: Firstblock after VPS reboot, second block after manual daemon restart

================================================== ================================================== ==============================

2017-11-02 17:09:00.342589|INFO |ServerLibPriv | |TeamSpeak 3 Server 3.0.13.8 (2017-07-19 08:26:51)
2017-11-02 17:09:00.349487|INFO |ServerLibPriv | |SystemInformation: Linux 4.4.0-96-generic #119-Ubuntu SMP Tue Sep 12 14:59:54 UTC 2017 x86_64 Binary: 64bit
2017-11-02 17:09:00.349553|INFO |ServerLibPriv | |Using hardware aes
2017-11-02 17:09:00.371035|INFO |DatabaseQuery | |dbPlugin name: SQLite3 plugin, Version 3, (c)TeamSpeak Systems GmbH
2017-11-02 17:09:00.371160|INFO |DatabaseQuery | |dbPlugin version: 3.11.1
2017-11-02 17:09:00.390844|INFO |DatabaseQuery | |checking database integrity (may take a while)
2017-11-02 17:09:00.468354|WARNING |Accounting | |Unable to find valid license key, falling back to limited functionality
2017-11-02 17:09:01.564179|INFO | | |Puzzle precompute time: 890
2017-11-02 17:09:01.564583|INFO |FileManager | |listening on 0.0.0.0:30033, 2a02:c207:3002:2714::3:30033
2017-11-02 17:09:01.565433|ERROR | | |TS3ANetwork::ResolveHostName failed error: -3 (Temporary failure in name resolution) 11
2017-11-02 17:09:01.565478|ERROR | | |Could not open default UDP connection for weblist
2017-11-02 17:09:01.632538|INFO |Query | |listening on 0.0.0.0:10011, 2a02:c207:3002:2714::3:10011
2017-11-02 17:10:32.650003|INFO |ServerMain | |Received signal SIGTERM, shutting down.


================================================== ================================================== ==============================

2017-11-02 17:10:33.778154|INFO |ServerLibPriv | |TeamSpeak 3 Server 3.0.13.8 (2017-07-19 08:26:51)
2017-11-02 17:10:33.778271|INFO |ServerLibPriv | |SystemInformation: Linux 4.4.0-96-generic #119-Ubuntu SMP Tue Sep 12 14:59:54 UTC 2017 x86_64 Binary: 64bit
2017-11-02 17:10:33.778299|INFO |ServerLibPriv | |Using hardware aes
2017-11-02 17:10:33.779248|INFO |DatabaseQuery | |dbPlugin name: SQLite3 plugin, Version 3, (c)TeamSpeak Systems GmbH
2017-11-02 17:10:33.779284|INFO |DatabaseQuery | |dbPlugin version: 3.11.1
2017-11-02 17:10:33.779658|INFO |DatabaseQuery | |checking database integrity (may take a while)
2017-11-02 17:10:33.791695|WARNING |Accounting | |Unable to find valid license key, falling back to limited functionality
2017-11-02 17:10:34.826129|INFO | | |Puzzle precompute time: 1006
2017-11-02 17:10:34.826608|INFO |FileManager | |listening on 0.0.0.0:30033, 2a02:c207:3002:2714::3:30033
2017-11-02 17:10:34.833770|INFO |Query | |listening on 0.0.0.0:10011, 2a02:c207:3002:2714::3:10011


Teamspeak-Server-Version: 3.0.13.8, No licence

VPS: Ubuntu 16.04.3[up-to-date] with Plesk Onyx, Ports 4242,9987,10011,30033,41144 are open.


I would be glad if someone has either a similar problem or a solution or can tell me what mistakes were made.

yours sincerely,
bitbike