Hi, We've purchased a license, but cannot edit the license key in the 3CX Phone System Management Console. The only clue we have is the error message: However, I have tested DNS resolution from the commandline and it seems to work correctly. Code: ; <<>> DiG 9.9.5-9+deb8u14-Debian <<>> activation.3cx.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 37265 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;activation.3cx.com. IN A ;; ANSWER SECTION: activation.3cx.com. 300 IN A 188.8.131.52 ;; Query time: 34 msec ;; SERVER: 2a02:1800:100::44:1#53(2a02:1800:100::44:1) ;; WHEN: Mon Jan 29 14:04:56 CET 2018 ;; MSG SIZE rcvd: 63 Does anybody know how to proceed with the activation? Our PBX has version 15.5.6354.2 and is running on top of a Debian Linux.