Firewall shuts out all traffic ?

Hi,

I have installed Comodo on a remotely hosted server, and had no problems during installation.
I set three ‘trusted zones’ that all worked, even when all other traffic was blocked.
Last Friday suddenly all users lost connection to the server, and a ping results in timeout.
I tried from all trusted zones, and other connections, but to no result.
Does anyone know if this can be the result of the firewall, could it be a hack or glitch ?

Until this happened the only thing I can say is … (R)