I faced this issue on MAC when I was trying to connect to vpn using Cisco AnyConnect. The error message was:
“The VPN client was unable to successfully verify the IP forwarding table modifications. A VPN connection will not be established.”
If you are also facing this issue, you can apply the below approach.
- Click your apple menu top left corner.
- Goto system preferences > network >advanced tab > tcp/ip
- Then click on renew dhcp lease
- Then ok
- Now test the vpn connectivity.
I hope you will be able to connect now. If you are still facing issue, I will suggest you to contact your IT Support if any, or restart your laptop or else search blogs, forums for the related issue.