I not use gateway management , I use Dnsthingy , I do not understand why it blocks internet access to the server, PING google.com (10.0.0.2) 56(84) bytes of data.
64 bytes from gateway.liceonuevo.local (10.0.0.2): icmp_seq=1 ttl=64 time=0.019 ms
64 bytes from gateway.liceonuevo.local (10.0.0.2): icmp_seq=2 ttl=64 time=0.047 ms
64 bytes from gateway.liceonuevo.local (10.0.0.2): icmp_seq=3 ttl=64 time=0.053 ms
64 bytes from gateway.liceonuevo.local (10.0.0.2): icmp_seq=4 ttl=64 time=0.047 ms

yum update
Complementos cargados:clearcenter-marketplace, fastestmirror
ClearCenter Marketplace: fetching repositories...
ClearCenter Marketplace: [Errno 110] Expiró el tiempo de conexión


When I deactivate the DNS, the server returns to normal

I have reinstalled the dnsthingy and with the same result