This could be a taste of what is to come. AWS shut down the Clearcenter servers yesterday (which includes the forums so take note of this post manually, don't bookmark it). Presumably the bill was eventually paid but not everything has come back up. If it happens permanently, things you could do to help yourself:

1 - move out of the way /etc/yum/pluginconf.d/clearcenter-marketplace.conf
2 - install ntp as this overrides the timesync app, or edit /etc/clearos/date.conf and put in your favourite time server, perhaps using a more local one like 0.uk.pool.ntp.org for me.
3 - The clearsdn.com domain will go down, try adding a line to a file you create (with any name you want) in /etc/dnsmasq.d/ with:Then restart dnsmasq. I didn't get to fully test it yesterday, but it may sort out the unresponsive webconfig. Don't do it unless you have done 1) and 2). If that does not work, you'll have to hunt down the the FQDN which you need to redirect to 127.0.0.0 (not a typo, don't use 172.0.0.1).
4 - If you need a Free DDNS name, you'll have to find a provider then either install their own DDNS updater or use ddclient to update it.