Fortinet Document Library

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Cookbook

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Ignoring the AUTH TLS command

If the FortiGate receives an AUTH TLS (PBSZ and PROT) command before receiving plain text traffic from a decrypted device, by default, it will expect encrypted traffic, determine that the traffic belongs to an abnormal protocol, and bypass the traffic.

When the ssl-offloaded command is enabled, the AUTH TLS command is ignored, and the traffic is treated as plain text rather than encrypted data. SSL decryption and encryption are performed by an external device.

To enable SSL offloading:
config firewall profile-protocol-options
    edit "test"
        config ftp
            set ssl-offloaded yes
        end
        config imap
            set ssl-offloaded yes
        end
        config pop3
            set ssl-offloaded yes
        end
        config smtp
            set ssl-offloaded yes
        end
    next
end

Ignoring the AUTH TLS command

If the FortiGate receives an AUTH TLS (PBSZ and PROT) command before receiving plain text traffic from a decrypted device, by default, it will expect encrypted traffic, determine that the traffic belongs to an abnormal protocol, and bypass the traffic.

When the ssl-offloaded command is enabled, the AUTH TLS command is ignored, and the traffic is treated as plain text rather than encrypted data. SSL decryption and encryption are performed by an external device.

To enable SSL offloading:
config firewall profile-protocol-options
    edit "test"
        config ftp
            set ssl-offloaded yes
        end
        config imap
            set ssl-offloaded yes
        end
        config pop3
            set ssl-offloaded yes
        end
        config smtp
            set ssl-offloaded yes
        end
    next
end