I am using Watchguarg Firebox X750e firewall. Last day, I made some changes on the HTTP & HTTPS policies as well as Webblocker subscriptions. from that time, whenever my users are accessing the authentication page of firebox, It is blocking the request, and from that point of time the firewall is blocking all the packets from that specifed IP. even it is not allowing to ping. I tried by disable all web blocking subscriptions, but not solved. Now I opened all packets to external by using 'Any' rule and we are able to work now (For the blocked IPs, even after Any rule applied, it exists as blocked only till a firewall reboot).