• SonicOS 7.1
• About SonicOS
  • Working with SonicOS
  • SonicOS Workflow
  • How to Use the SonicOS Administration Guides
  • Guide Conventions
• About DPI-SSL
  • Using DPI-SSL
    • Supported Features
      • Support for Local CRL
      • TLS Certificate Status Request Extension
      • Support for Ciphers
      • DPI-SSL and CFS HTTPS Content Filtering Work Independently
      • Original Port Numbers Retained in Decrypted Packets
    • Security Services
  • Deployment Scenarios
  • Proxy Deployment
  • Customizing DPI-SSL
  • Connections per Appliance Model
• DPI-SSL/TLS Client
  • Deploying the DPI-SSL/TLS Client
    • Configuring General DPI-SSL/TLS Client Settings
      • Enabling DPI-SSL Client on a Zone
    • Selecting the Re-Signing Certificate Authority
      • Adding Trust to the Browser
    • Configuring Exclusions and Inclusions
      • Configuring Exclusions and Inclusions by Objects and Groups
      • Configuring Exclusions and Inclusions by Common Name
        • Viewing Status of DPI-SSL Default Exclusions
        • Rejecting or Accepting Default Common Names
        • Adding Custom Common Names
        • Editing Custom Common Names
        • Deleting Custom Common Names
        • Showing Connection Failures
        • Updating Default Exclusions Manually
      • Configuring Exclusions and Inclusions by CFS Category
  • Applying DPI-SSL/TLS Client
    • Performing Content Filtering using DPI-SSL
    • Filtering Content by App Rules using DPI-SSL
      • Enabling App Control Service on a Zone
  • Viewing DPI-SSL Status
• DPI-SSL/TLS Server
  • Deploying the DPI-SSL/TLS Server
    • Configuring General DPI-SSL/TLS Server Settings
      • Enabling DPI-SSL Server on a Zone
    • Configuring Exclusions and Inclusions
    • Configuring Server-to-Certificate Pairings
• SonicWall Support
  • About This Document

Support for Local CRL

A Certificate Revocation List (CRL) is a list of digital certificates that have been revoked by the issuing Certificate Authority (CA) before their scheduled expiration date and should no longer be trusted. A problem with contacting the CA for this list is that the browser cannot confirm whether it has reached the CA’s servers or if an attacker has intercepted the connection to bypass the revocation check.

Local CRL is relative to typical CRL (or online CRL). For typical CRL, the client needs to download the CLR from a CRL distribution point. If the client is unable to download the CRL, then by default, the client trusts the certificate. Contrary to typical CRL, Local CRL maintains a list of revoked certificates locally in import memory for DPI-SSL to verify whether the certificate has been revoked.

For further information about this feature, contact Technical Support.