I am having the same issue with an iPhone 3GS with iOS 4. I was trying to connect with the VPN on the iPhone and could not connect. I reset the network settings which removed my VPN profiles. I tried to reinstall the VPN profiles with Safari. The instillation looks normal but when I go to connect with the VPN there are no VPN profiles installed. I am going to try to manually configure a VPN on the iPhone to see if that works.
I am having the same issue with an iPhone 3GS with iOS 4. I was trying to connect with the VPN on the iPhone and could not connect. I reset the network settings which removed my VPN profiles. I tried to reinstall the VPN profiles with Safari. The instillation looks normal but when I go to connect with the VPN there are no VPN profiles installed. I am going to try to manually configure a VPN on the iPhone to see if that works.