Ich habe gerade mal geschaut, der Server kann definitiv über Port 443 raus sowie ist vom Hostsystem aus die Adresse erreichbar, daran kann es also nicht liegen.
Code:
nslookup ts3services.teamspeak.com
Server: 213.133.99.99
Address: 213.133.99.99#53
Non-authoritative answer:
Name: ts3services.teamspeak.com
Address: 104.20.75.196
Name: ts3services.teamspeak.com
Address: 104.20.74.196
Code:
dig ts3services.teamspeak.com
; <<>> DiG 9.10.3-P4-Debian <<>> ts3services.teamspeak.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20803
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;ts3services.teamspeak.com. IN A
;; ANSWER SECTION:
ts3services.teamspeak.com. 274 IN A 104.20.74.196
ts3services.teamspeak.com. 274 IN A 104.20.75.196
;; Query time: 0 msec
;; SERVER: 213.133.99.99#53(213.133.99.99)
;; WHEN: Tue Apr 30 19:06:02 CEST 2019
;; MSG SIZE rcvd: 86
Grüße