Getting Warning Message - Your pc does not meet the host checking requirements set by the firewall.

[VRG]

I am getting the below error message when connecting to the FortiClient VPN

Your pc does not meet the host checking requirements set by the firewall. Please try again in a few minutes. If the issue persists check that your OS version meets the minimum requirements, that your antivirus and firewall applications are installed and running properly. and that you have the correct network interface. (-455)

[Zhuo]

Check the Host Check requirements in the SSLVPN portal of the firewall. The computer needs to meet the requirements to connect normally.

[AEK]

Hope this helps:

https://community.fortinet.com/t5/FortiClient/Technical-Tip-FortiClient-Host-Checker-Support-for-Win...

[rtichkule]

Host check verifies whether the client device has AntiVirus, firewall, both, or other custom security software enabled on their Windows device. Admins may also define their own custom host check software, which supports Windows and Mac OS.

You can refer below document and verify the configuration of host check.

Configuring OS and host check | FortiGate / FortiOS 7.4.2 | Fortinet Document Library