Best way to troubleshoot a failing Point to Site VPN

I have created a point to site VPN that works fine on my own personal laptop, but not on my corporate workstation (Error: 2147024891)

What is the best way to trouble shoot this? I'm assuming it's not a firewall issue as port 443 is open on our firewalls, but apart from that, I don't know what else to check - Any ideas?

Thanks