Decrypt Traffic for Full Visibility and Threat Inspection
The best practice security policy dictates
that you decrypt all traffic except sensitive categories, which
include Health, Finance, Government, Military, and Shopping.
Use
decryption exceptions only where required, and be precise to ensure
that you are limiting the exception to a specific application or
user based on need only:
- If decryption breaks an important application, create an exception for the specific IP address, domain, or common name in the certificate associated with the application.
- If a specific user needs to be excluded for regulatory or legal reasons, create an exception for just that user.
To
ensure that certificates presented during SSL decryption are valid, configure the firewall to perform CRL/OCSP checks.
Best
practice Decryption policy rules include a strict Decryption Profile.
Before you configure SSL Forward Proxy,
create a best practice Decryption Profile () to attach
to your Decryption policy rules:
- Configure the settings to block exceptions during SSL negotiation and block sessions that can’t be decrypted:
- Configure the to block use of vulnerable SSL/TLS versions (TLS 1.0 and SSLv3) and to avoid weak algorithms (MD5, RC4, and 3DES):
- For traffic that you are not decrypting, configure theNo Decryptionsettings to block encrypted sessions to sites with expired certificates or untrusted issuers:
