I have multiple VPN clients installed on my laptop. The cisco VPN client, The sonicwall vpn client and the pptp client from windows 7. When I use the microsoft VPN client over pptp and then attempt to VPN into any windows server (PPTP passthrough from firewalls) . After the PPTP connection is made using the windows VPN client, when attempting to use remote desktop to any version of windows fails with encryption issues.
If I go to the network settings, then network connections and edit the Local Area Connection and remove the (Cisco) NDE LightWeight Filter ad restart then I can use Windows PPTP and have no issues with using remote desktop.
Then to use the Cisco VPN client I have to reinstall the DNE Light Weight Filter