hi,
if you want to block all https traffic, you can try this;
1. in Services > Add New, enter a new service with Service Name: https
2. tick the Internal check box.
3. click Add
4. in firewall > packet filter > filtering rules for internal networks > configure rules > add new;
enter Decision = DENY
Source = any
Destination=any
Service=https
5. Click Add
i hope this helps.