Ubuntu Network Manager have Fortinet SSL VPN Plug-in for connect you to HQ network. Below you will find instructions for activating the plu-gin and configuring it.
First:
Install plugin:
sudo apt-get install openfortivpn
sudo apt-get install network-manager-fortisslvpn
sudo apt-get install network-manager-fortisslvpn-gnome
Second:
Configure NM:


Third:
do the magic:
For work correctly we must find trusted-cert string and insert it in the client Advanced settings.
sudo openfortivpn ssl.glitchlist.com:443 -u glitchusr1 -v
WARN: Bad port in config file: "0".
DEBUG: Loaded config file "/etc/openfortivpn/config".
VPN account password: [INSERT PASSWORD]
DEBUG: Config host = "ssl.glitchlist.com"
DEBUG: Config realm = ""
DEBUG: Config port = "443"
DEBUG: Config username = "glitchusr1"
DEBUG: Config password = "********"
DEBUG: server_addr: 10.99.208.1
DEBUG: server_port: 443
DEBUG: gateway_addr: 10.99.208.1
DEBUG: gateway_port: 443
DEBUG: Gateway certificate validation failed.
ERROR: Gateway certificate validation failed, and the certificate digest in not in the local whitelist. If you trust it, rerun with:
ERROR: --trusted-cert 790e6699900a4f8e9ab2612ddbf4757d290c7b621329b69da963b83948b0c142
ERROR: or add this line to your config file:
ERROR: trusted-cert = 790e6699900a4f8e9ab2612ddbf4757d290c7b621329b69da963b83948b0c142
ERROR: Gateway certificate:
ERROR: subject:
ERROR: CN=*.glitchlist.com
ERROR: issuer:
ERROR: C=US
ERROR: O=DigiCert Inc
ERROR: OU=www.digicert.com
ERROR: CN=RapidSSL RSA CA 2018
ERROR: sha256 digest:
ERROR: 790e6699900a4f8e9ab2612ddbf4757d290c7b621329b69da963b83948b0c142
INFO: Closed connection to gateway.
DEBUG: server_addr: 10.99.208.1
DEBUG: server_port: 443
DEBUG: gateway_addr: 10.99.208.1
DEBUG: gateway_port: 443
DEBUG: Gateway certificate validation failed.
ERROR: Gateway certificate validation failed, and the certificate digest in not in the local whitelist. If you trust it, rerun with:
ERROR: --trusted-cert 790e6699900a4f8e9ab2612ddbf4757d290c7b621329b69da963b83948b0c142
ERROR: or add this line to your config file:
ERROR: trusted-cert = 790e6699900a4f8e9ab2612ddbf4757d290c7b621329b69da963b83948b0c142
ERROR: Gateway certificate:
ERROR: subject:
ERROR: CN=*.glitchlist.com
ERROR: issuer:
ERROR: C=US
ERROR: O=DigiCert Inc
ERROR: OU=www.digicert.com
ERROR: CN=RapidSSL RSA CA 2018
ERROR: sha256 digest:
ERROR: 790e6699900a4f8e9ab2612ddbf4757d290c7b621329b69da963b83948b0c142
INFO: Could not log out.


EXPLANATION:
Gateway certificate validation failed, and the certificate digest in not in the local whitelist. If you trust it, rerun with:
–trusted-cert 790e6699900a4f8e9ab2612ddbf4757d290c7b621329b69da963b83948b0c142
or add this line to your config file:
Hope this help!
.glitchlist crew