Can't access ports from VPN (Mac OS High Sierra)

This is a very odd problem so please bare with me.

I am running MacOS High Sierra v10.13.5 from my MacBook Pro 2010. I connect to my office servers using VPN SSL (FortiClient VPN).

Here's what's going on:

1. Successfully Connect to the office via VPN SSL
2. When I attempt to follow a path (smb://________) it tells give me an error saying that the the certificate's path is not valid.
3. I attempted to configure the vpn by going to the

• I've uninstalled and re-installed the VPN client and that did not fix the problem.
• Since the issue happens when
  • (A) my VPN server is connected;
  • (B) the Remote server is not the issue;

I configured it by

1. Choosing Apple menu > System Preferences, then click Network.
2. Clicked the Add button at the bottom of the list, clicked the Interface pop-up menu and chose VPN, then clicked the VPN Type pop-up menu and choose the VPN type. Entered name for the service, then clicked Create.
3. Entered the server address, account name, and I was not given any other authentication settings such as Shared secret.
4. I'm stuck her, the office IT person, does not know what a Shared secret is and neither do I. I contacted Mac support they told me to contact FortiClient. But, I've not had any luck nor from Apple chat nor my client's IT department.

Help, how do I get a shared secret?

C

This might be some sort of port blocking/forwarding issue but I don't know how to diagnose that. I've turned off the Mac Firewall but that had no impact.

Hopefully someone can help me diagnose this problem.