TRITON - Web Security Help, Version 7.7 - Websense

Refine Filtering Policiesmessaging data, for example, can enter a network whose firewall blocks instantmessaging protocols by tunneling through HTTP ports. Websense software accuratelyidentifies these protocols, and filters them according to policies you configure.NoteIn Websense Web Filter and Websense Web Securitydeployments, Network Agent must be installed to enableprotocol-based filtering.With Websense Web Security Gateway, it is possible tofilter non-HTTP protocols that tunnel over HTTP portswithout using Network Agent. See Tunneled protocoldetection, page 192, for more information.In addition to using Websense-defined protocol definitions, you can define customprotocols for filtering. Custom protocol definitions can be based on IP addresses orport numbers, and can be edited.To block traffic over a specific port, associate that port number with a customprotocol, and then assign that protocol a default action of Block.To work with custom protocol definitions, go to Policy Management > FilterComponents, and then click Protocols. See Editing custom protocols, page 274, andCreating a custom protocol, page 277, for details.Filtering protocolsTRITON - Web Security Help | Web Security Solutions | Version 7.7.xRelated topics: Working with protocols, page 272 Editing custom protocols, page 274 Creating a custom protocol, page 277 Adding or editing protocol identifiers, page 275 Adding to a Websense-defined protocol, page 278When Network Agent is installed or with a Websense Web Security Gatewaydeployment, Websense software can block Internet content transmitted over particularports, or using specific IP addresses, or marked by certain signatures, regardless of theTRITON - Web Security Help 273