One of my clients is not able to access their website unless they disable their Linksys routers' firewall. They are having this problem both at their home and their office locations. They had a similar issue before, and they changed their home ip addresses and that resolved it. That did not resolve it this time and it seems to be connected to their firewall rules as when the firewall is disabled they can access the site. The concern is that it may be happening for people that could be their potential clients. I have gone through cPanel to check for blacklisted IP addresses for which there was none, and I ran a security site check to check for blacklisting or malware and found none. Of course they are concerned that others might not be able to access their site as well, although I personally have not been able to recreate this issue anywhere other than their locations. With the firewall up they are unable to access anything on the server except for one site. That site had an SSL, so I added an SSL to their site in hopes that it would resolve the issue, but it did not correct it. It is on a Hostgator VPS. I opened a ticket with them and they could not find anything that would cause it. The client does have a VLAN that connects the two locations that cannot access the server with the firewall up. These routers have VERY limited options on their firewall, I have even disabled all options except the firewall itself with no results. It continues to show it as if the server is u reachable as if there wasn't an internet connection (but it only appears on sites on that server except one site). Any help in helping resolve this issue would be much appreciated.
The site they are trying to access is mcwhorterheatingandair.com