I have the same problem.
Could not contact registration server, please try again later. at /tmp/par-726f6f74/cache-fb62cc363f2aebbfd93f52a6ce26d316921d09b7/inc/lib/FOP2/License.pm line 356, <> line 1.
root@pbx:/home/cbuser# ping -c 4 www.fop2.com
PING www.fop2.com (104.236.110.4) 56(84) bytes of data.
64 bytes from 104.236.110.4 (104.236.110.4): icmp_seq=1 ttl=53 time=120 ms
64 bytes from 104.236.110.4 (104.236.110.4): icmp_seq=2 ttl=53 time=119 ms
64 bytes from 104.236.110.4 (104.236.110.4): icmp_seq=3 ttl=53 time=119 ms
64 bytes from 104.236.110.4 (104.236.110.4): icmp_seq=4 ttl=53 time=120 ms
--- www.fop2.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 119.816/120.057/120.557/0.458 ms
root@pbx:/home/cbuser# telnet fop2.com 443
Trying 104.236.110.4...
Connected to fop2.com.
Escape character is '^]'.
Connection closed by foreign host.