If a user sees the block page immediately after the administrator claims to have unblocked the site, it is often a browser cache issue.
Allowing exceptions can create security holes. To maintain a balance between productivity (unblocking) and security, adhere to these best practices:
Create a or Static URL filter :
: This allows you to specifically "Allow" or "Exempt" a URL. Log in to the FortiGate web interface. Navigate to Security Profiles > Web Filter .