Can't join specific TS3-Server

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Hi there. As you can see, I cannot join some TS3-Servers. I tried some other server and they worked fine. You can see the following log from the most important server I cannot join any more. 03.08.2016 09:38:35 Info TeamSpeak 3 Client 3.0.19.4 (2016-07-14 10:16:58) 03.08.2016... Can't join specific TS3-Server