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kmohan
Staff
kmohan
Staff
December 17, 2025

Technical Tip: How to validate the certificate date between FortiGate SSL Inspection and Client Browser

  • December 17, 2025
  • 0 replies
  • 514 views
Description This article explains how to validate the expiration date of SSL-inspection certificates on FortiGate, with instructions for confirming the certificate status from the client’s browser.
Scope FortiGate.
Solution

Download and install the FortiGate CA Certificate on the client pc.

  • Certification shows the Validation date as below: Valid from 14-11-2025 to 15-11-2035.


CA FGT Certificate.png

 

  • The valid date issued by CA shows 10 years.
  • After installation on the client Pc under Trusted Root Certificate.
  • Try to access any URL, like public websites. It will show a validity from 9/05/2025 to 12/05/2025.

 

FACEbook.png

 

The CA issues the duration for the current websites; it will keep changing every time, but the same valid date will be visible on the browser:

  •  Select Certification valid -> Certification Path.
  •  Under the FortiGate Serial number, the Website SNI will be visible.
  • Select the GortiGate Serial Number, CA Certificate validation shows the same as the Deep_Inspection Certificate.


CA certificate validation.png


To verify the original Certificate Validation for the website, it can be verified from a third-party website.

 

SSL Shopper.png
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