FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
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Article Id 361969
Description This article describes how to check whether an address SSL connection is exempted by FortiGate SSL/SSH profile
Scope FortiGate.
Solution

SSL exemption can be configured in both certificate inspection and deep inspection profiles for many reasons such as:

  1. The CA is untrusted (Invalid Certificate).
  2. Privacy and Compliance Requirements.
  3. Application Compatibility.

 

Sometimes it is necessary to use SSL exemption for some applications when passing through FortiGate to avoid connection issues. For example, Microsoft Teams and Outlook stated in some other KB article:

Exempting Outlook from SSL inspection.

 

Refer to the following KB article to exempt SSL connection (changing the option of 'invalid SSL certificates' from block to allow):

Technical Tip: How to block invalid and revoked certificates

 

To verify whether the above changes work, refer to the following event log under Log & Reports -> Security Events -> SSL:

 

logid=1701062004 service="SSL" action="exempt" srcintfrole="lan" dstintfrole="lan" srcintf="internal3" dstintf="VLAN-22" eventtype="ssl-exempt" profile="Clone of deep-inspection" hostname="*.microsoft.com" msg="SSL connection is exempted based on address."

 

Note:

The default SSL/SSH profile cannot be edited. Clone or create another new certificate inspection or deep inspection profile to implement this change if SSL exemption is required.