Firewall blocks browsers from loading slither.io (a game that uses websockets)

Comodo Internet Security - CIS Firewall Help - CIS
#1

Comodo Firewall 11 blocks applications that use the built-in “Web browser” ruleset from loading this game: http://slither.io

The game only loads if the ruleset is changed to “Allowed Application”.

#2

Not a bug as the ruleset only allows connects to specific ports, and in this case sliter.io uses TCP port 444. You can check the firewall log to confirm.