How to Block Multiple Subdomains

This document describes how to block multiple subdomains using a wildcard character.

Details

Subdomains can be blocked using URL Filtering (which requires a license).

To block multiple subdomains:

• Add the sites into the Block List of a URL Filtering profile. Examples of entry format:  *.office365.com or  *office365.com.

Note: Alternatively, custom URL categories can be created with the action set to block. 

• Apply the configured URL Filtering profile to the appropriate security rule.

Multiple sub-domains cannot be blocked using a wildcard symbol in FQDN address objects, as wildcards are not allowed for use in those objects.

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