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New Contributor

SSL certificate inspection


really sometimes it happens that ssl (certificate) inspection block some kind of traffic. I've guessed that the problem was related to ssl inspection thanks to sniffing handshakes between client and server. But which is the best way to troubleshoot ssl/tls inspection related issues ? There is no specific log for that ?


FortiOS 5.2.9 FGT 800-C 

New Contributor

What type of errors are you getting in the browser? I think I might be getting the same error. 


IE tells me that I need to enable TLS 1.0, 1.1, and 1.2 and it could be an unsupported Cipher suite.


Chrome returns a ERR_Connection_Closed


Are you seeing the same thing?


The best way to troubleshoot is to make an exception for the page that is seeing the issue....make everything be identical except for the DPI. From there you can see if it is the culprit.


Some sites, applications, and other endpoints will not accept a MITM cert though so exceptions will need to be made.