VPN Issue after Fortinet install/uninstall

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We noticed that after installing Fortinet VPN our Windows VPNs configured on the same machine stopped working.

 uninstalling the Fortinet client had no effect.

 We did notice that the services, IKEEXT and PolicyAGent were disabled.

 Making these auto start and rebooting fixed the issue.

 We are not sure that Fortinet VPN has anything to do with causing this - however only those machine with the client have shown this issue.

 Thanks to this posting from Stephan for the solution:

 https://social.technet.microsoft.com/Forums/lync/en-US/46667a11-5a49-4549-9e18-7d07e8001c35/error-789-when-trying-to-establish-l2tp-vpn-connection?forum=w7itpronetworking

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