forticlient 7.4.3.1736 on linux hangs on connecting

Hello rgros, 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

Thanks, 

Do you mean SSL VPN or IPsec?

First think you should do is to check if your connection attempt is reaching the remote FortiGate.

Run the following on the remote FGT:

diag sniffer packet any "host x.x.x.x" 4

Where x.x.x.x is the client public IP address.

If you receive the traffic on FGT on the right port (IPsec or SSL VPN), then you can try debug the VPN connection.

If it is IPsec, run this:

diagnose vpn ike log filter rem-addr4 x.x.x.x
diagnose debug application ike -1
diagnose debug application fnbamd -1
diagnose debug console timestamp enable
diagnose debug enable

If it is SSL VPN, run this:

diagnose vpn ssl debug-filter src-addr4 x.x.x.x
diagnose debug application sslvpn -1
diagnose debug application fnbamd -1
diagnose debug console timestamp enable
diagnose debug enable

Hope it helps.

thanks for your help. I use SSL VPN. I have no access myself to fortigate, but checking fortigate is a good starting point. I have made a request to the check the connection first. I know by experience this takes some time, but I let you know when I know more!