I saw this article:
http://members.asternic.biz/knowledge_base/faq-could-not-contact-registration-server
Not a problem on my server:
# 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=55 time=14.1 ms
64 bytes from 104.236.110.4 (104.236.110.4): icmp_seq=2 ttl=55 time=13.4 ms
64 bytes from 104.236.110.4 (104.236.110.4): icmp_seq=3 ttl=55 time=13.1 ms
64 bytes from 104.236.110.4 (104.236.110.4): icmp_seq=4 ttl=55 time=13.2 ms
--- www.fop2.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 13.179/13.496/14.161/0.405 ms
# sestatus
SELinux status: disabled
No iptables rules either

