All of a sudden my sites are not visible to me hosted in the same cirtex hosting account. I have verified that it wasn't spyware messing with my local computer and can view the site via a proxy. They use cpanel and there is no block visible, but there has to be something somehwere. I told them to restart and that did make the site visible until I checked in the morning, Where would a block be if this is it and is there a chance this was done by a hacker? Thanks
If it is just to you, it is likely a firewall rule. Many systems employ brute force detectors such as bfd that monitor connection requests and deny the ip after a set number of invalid password attempts.