Sometimes there is a requirement to create an exception for Deny rule. You can use an «Allow rule» for this purpose. Regardless the sort-order in the web-interface, allow rules are applied before deny rules.
If you need to allow access of a particular user to site or host even is quota is exceeded or user is disabled - use «Allow rule» with «allow even if user is disabled» option.
Deny and Allow rules are applied in the following order (from top to bottom):
You can specify a range of ports using «-» as well as list of ports using comma - «,» or space-bar -« ».