Device > Certificate Management > SSL Decryption Exclusion
Table of Contents
Device > Certificate Management > SSL Decryption Exclusion
View and manage SSL decryption exclusions
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. There are two types of decryption exclusions,
predefined exclusions and custom exclusions:
- Predefined decryption exclusions allow applications and services that might break when the firewall decrypts them to remain encrypted. Palo Alto Networks defines the predefined decryption exclusions and delivers updates and additions to the predefined exclusions list at regular intervals as part of the applications and threats content update. Predefined exclusions are enabled by default, but you can choose to disable the exclusion as needed.
- You can create custom decryption exclusions to exclude server traffic from decryption. All traffic originating from or destined to the targeted server remains encrypted.You can also exclude traffic from decryptionbased on application, source, destination, URL category, and service.
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Use the settings on this page to Modify or Add a Decryption
Exclusion and to Manage Decryption
Exclusions.
SSL Decryption Exclusions
Settings | Description |
|---|---|
Modify or Add a Decryption
Exclusion | |
Hostname | Enter a Hostname to define a
custom decryption exclusion. The firewall compares the hostname to
the SNI requested by the client or to the CN presented in the server
certificate. The firewall excludes sessions in which the server
presents a CN that contains the defined domain from
decryption. You can use asterisks (*) as wildcards to create
decryption exclusions for multiple hostnames associated with a
domain. Asterisks behave the same way that carets (^) behave for
URL category
exceptions—each asterisk controls one variable subdomain
(label) in the hostname. This enables you to create both very
specific and very general exclusions. For example:
To exclude video-stats.video.google.com from decryption but not
video.google.com, add *.*.google.com to the SSL Decryption Exclusion
list. Hostnames should be unique for each entry. If a
predefined entry is delivered to the firewall that matches an
existing custom entry, the custom entry takes precedence. You
cannot edit the Hostname for a predefined decryption
exclusion. |
Shared | Select Shared to share a
decryption exclusion across all virtual systems in a multiple
virtual system firewall. While predefined decryption
exclusions are shared by default, you can enable and disable both
predefined and custom entries for a specific virtual
system. |
Description | (Optional) Describe the application that you
are excluding from decryption, including why the application breaks
when decrypted. |
Exclude | Exclude the application from decryption. Disable this
option to start decrypting an application that was previously
excluded from decryption. |
Manage Decryption Exclusions | |
Enable | Enable one or more entries to
exclude them from decryption. |
Disable | Disable one or more predefined
decryption exclusions. Because decryption exclusions identify
applications that break when decrypted, disabling one of these
entries will cause the application to be unsupported. The firewall
will attempt to decrypt the application and the application will
break. You can use this option if you want to ensure certain
encrypted applications do not enter your network. |
Show obsoletes | Show obsoletes to view
predefined entries that Palo Alto Networks no longer defines as
decryption exclusions. More about obsolete
entries:Updates to predefined decryption exclusions
(including the removal of a predefined entry) are delivered to the
firewall as part of Applications and Threats content updates.
Predefined entries with Exclude from
decryption enabled are automatically removed from
the list of SSL decryption exclusions when the firewall receives a
content update that no longer includes that entry. However,
predefined entries with Exclude from
decryption disabled remain on the SSL decryption
list even after the firewall receives a content update that no
longer includes that entry. When you Show
obsoletes, you will see these disabled predefined
entries that are not currently being enforced; you can remove these
entries manually as needed. |
Show Local Exclusion Cache | Show Local Exclusion Cache
displays the sites that the firewall automatically excluded from
decryption because of technical circumstances that prevent
decryption, such as pinned certificates, client authentication, or
unsupported ciphers. The Local SSL Decryption Cache differs from the
SSL Decryption Exclusion List (), which contains the sites that prevent decryption
that Palo Alto Networks has identified and to which you can add
permanent decryption exclusions that you choose to make. The the
firewall populates the Local SSL Decryption Cache with locally
discovered decryption exceptions, based on the settings of the
Decryption profile associated with the Decryption policy rule that
controls the traffic. Excluded sites remain in the local cache
for 12 hours and then age out. Each exclusion entry includes
information about the application, the server, the reason why the
firewall automatically excluded the site from decryption, the
Decryption profile applied to the traffic, and the Vsys. |