A network administrator has enabled full SSL inspection and web filtering on FortiGate. When visiting any HTTPS websites, the browser reports certificate warning errors. When visiting HTTP websites, the browser does not report errors.
What is the reason for the certificate warning errors?
When full SSL inspection is enabled, FortiGate intercepts HTTPS traffic, decrypts it for inspection, and re-encrypts it using its own SSL certificate before forwarding it to the browser. If the browser does not trust the SSL certificate being used by FortiGate for re-encryption, it will display certificate warning errors. To resolve this, the certificate used by FortiGate for SSL inspection must be installed and trusted in the browser's certificate store.
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