URL Category Exceptions
Guidelines for specifying URLs that you want to enforce policy against.
You can exclude specific websites from URL category enforcement, ensuring that these websites are blocked or allowed regardless of their associated URL category. For example, you could block a URL category but choose to allow certain sites that fall within that category. To create these kinds of exceptions to URL category enforcement:
- Add the IP addresses or URLs of the sites you want to explicitly block or allow by creating a Create a Custom URL Category list ().ObjectsCustom ObjectsURL Category
- Use an External Dynamic List in a URL Filtering profile. The benefit to using an External Dynamic List to specify the sites you want to enforce separately from their URL categories is that you can update the External Dynamic List without performing a configuration change or commit on the firewall.
The following guidelines describe how to populate URL Category block and allow lists, or a text file that you’re using as the source of an external dynamic list for URLs:
Basic Guidelines For URL Category Exception Lists
- Enter the IP addresses or URLs of websites that you want to enforce separately from the associated URL category.
- List entries must be an exact match and are case-insensitive.
- Enter a string that is an exact match to the website (and possibly, specific subdomain) for which you want to control access, or use wildcard characters to allow an entry to match to multiple website subdomains. For details on using wildcard characters, review Wildcard Guidelines for URL Category Exception Lists.
- Omithttpandhttpsfrom URL entries.
- Each URL entry can be up to 255 characters in length.
Wildcard Guidelines for URL Category Exception Lists
You can use wildcards in URL Category exception lists to easily configure a single entry to match to multiple website subdomains and pages, without having to specify exact subdomains and pages.
Follow these guidelines when creating wildcard entries:
- The following characters are considered token separators: . / ? & = ; +Every string separated by one or two of these characters is a token. Use wildcard characters as token placeholders, indicating that a specific token can contain any value.
- In place of a token, you can use either an asterisk (*) or a caret (^) to indicate a wildcard value.
- Wildcard characters must be the only character within a token; however, an entry can contain multiple wildcards.
How to Use Asterisk (*) and Caret (^) Wildcards
Use to indicate one or more variable subdomains. If you use
*, the entry will match any additional subdomains, whether at the beginning or the end of the URL. Use a forward slash at the end of the entry if you do not want to match any additional subdomains beyond that point.
Use to indicate one variable subdomain.
mail.^.commatches to mail.company.com but not mail.company.sso.com.
Do not create an entry with consecutive asterisk (*) wildcards or more than nine consecutive caret (^) wildcards—entries like these can affect firewall performance.
For example, do not add an entry like
mail.*.*.com; instead, depending on the range of websites you want to control access to, enter
mail.^.^.com. An entry like
mail.*.commatches to a greater number of sites than
mail.*.commatches to sites with any number of subdomains and
mail.^.^.commatches to sites with exactly two subdomains.
URL Category Exception List—Wildcard Examples
The following table lists examples of URL exception lists entries using wildcards, and examples of the sites that these entries match to.
URL Exception List Entry
Example Set 1
Example Set 2
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