We have a nagging issue that appeared recently where our own company public website is suddenly not accessible, from one of our sites. We can't even ping it and tracert times out. It has randomly come back and then goes away again, sometimes a firewall reboot helps, sometimes it doesn't. All other websites are accessible during this time and the company website is accessible from all other locations. This same issue has happened at 3 of our sites, but one has become a chronic issue.