If you can't connect to the Teamspeak server using ts3server://321dive , try these methods.

• Update your client. 

• Tested Client Versions - TeamSpeak 6 Beta, TeamSpeak 5 and TeamSpeak  3.6.2 +

Old versions from http://ftp.4players.de/pub/hosted/ts3/releases  (EOL)

• We recommend you to use "ts3server://321dive" or "ts3server://blackwatch" instead of the IP or Domain name.

-RILEY