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Refine Your Policies > Protocol-based policy enforcement
Protocol-based policy enforcement
Administrator Help | Forcepoint Web Security and Forcepoint URL Filtering | v8.5.x
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The Master database includes protocol definitions used to manage Internet protocols other than HTTP, HTTPS and FTP. These definitions include Internet applications and data transfer methods such as those used for instant messaging, streaming media, file sharing, file transfer, Internet mail, and other network and database operations.
These protocol definitions can even be used to manage protocols or applications that bypass a firewall by tunneling through ports normally used by HTTP traffic. Instant messaging data, for example, can enter a network whose firewall blocks instant messaging protocols by tunneling through HTTP ports. Web protection software accurately identifies these protocols, and filters them according to policies you configure.
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How protocol requests are managed
When a protocol request is made, the following steps are used to determine whether to block or permit the request:
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If any of this information cannot be determined, all content associated with the protocol is permitted.
If the protocol is FTP, HTTPS, or gopher, a check is first performed to see if the protocol is blocked. If the protocol is permitted, Filtering Service performs a URL lookup to see if the requested site is permitted or blocked.
Defining custom protocols
In addition to using pre-defined protocol definitions, you can define custom protocols. Custom protocol definitions can be based on IP addresses or port numbers, and can be edited.
To block traffic over a specific port, associate that port number with a custom protocol, and then assign that protocol a default action of Block. When ports are used to define a protocol, blocking the port intercepts all Internet content entering your network over that port, regardless of source.
 
Note 
To work with custom protocol definitions, go to Policy Management > Filter Components, and then click Protocols. See Editing custom protocols and Creating a custom protocol for details.
 

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