FortiClient VPN 7.0.7.0345 connectivity issue

[ytrapal]

Error message

Unable to establish the VPN connection. The VPN server may be unreachable or your identity certificate is not trusted. (-5)

Hardware

Virtual Machine with OS Windows 7 SP1

Hints

TLS1.1 and TLS1.2 enabled

Logs available

Application's plus Wireshark ones, available on request.

Hint

Is TLS1.3 mandatory ?

[pavankr5]

Hello @ytrapal ,

Please check this article on Error 'Unable to establish the VPN connection. The VPN server may be unreachable. (-5)' on FortiClient with SSL VPN 
https://community.fortinet.com/t5/FortiClient/Technical-Note-Error-Unable-to-establish-the-VPN-conne...

Thanks

[ytrapal]

Hello @pavankr5,

thanks for the suggestion. I have already checked it, see also embedded photo in my question.
Is TLS 1.3 "mandatory" in later releases of Fortinet VPN ?