error message connecting to VPN

[admin_2]

I am not sure whether the Cisco 678 ADSL Router supports VPN but I set a nat entyr for VPN anyway.

The problem is when I use W2000 Pro to connect to the VPN (another W2000 Pro accepting VPN calls) I get the 721: The remote computer is not responding error message.

Could this be because the 678 doesn't support VPN?

[drolemc]

The 678 can be configured to allow VPN traffic through it. However, there might be problems in certain non-Cisco vendor implementations. Also, if you are using IPSec through PAT, AH must not be used and pre-share keys must be used.