Decryption Exclusions

Some applications can’t be decrypted for technical reasons and some traffic can’t be decrypted for business, compliance, or regulatory reasons. Make decryption exceptions only when you must.
You can exclude two types of traffic from decryption:
  • Traffic that breaks decryption for technical reasons, such as using a pinned certificate, an incomplete certificate chain, unsupported ciphers, or mutual authentication (decrypting blocks the traffic). Palo Alto Networks provides a predefined SSL Decryption Exclusion list (DeviceCertificate managementSSL Decryption Exclusion) that excludes hosts with applications and services that are known to break decryption technically from SSL Decryption by default. If you encounter sites that break decryption technically and are not on the SSL Decryption Exclusion list, you can add them to list manually by server hostname. The firewall blocks sites whose applications and services break decryption technically unless you add them to the SSL Decryption Exclusion list.
  • Traffic that you choose not to decrypt because of business, regulatory, personal, or other reasons, such as financial-services, health-and-medicine, or government traffic. You can choose to exclude traffic based on source, destination, URL category, and service.
To increase visibility into traffic and reduce the attack surface as much as possible, don’t make decryption exceptions unless you must.

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