VPN behind NAT on ZyWALLs

Hi,

Here is another problem.

I am trying to establish VPN between ZyWALL 2 which is behind a NAT ADSL router (non static IP) and ZyWALL 70 which is connected through DSL and has static WAN IP.

I have configured as it is said on Zyxell support webpages but they don't want to establish VPN tunnel.

In ZyWALL 70 there is an entry saying:

Rule[TEST_VPN] preshare key mismatch with peer

I am sure that keys are correct entered because I have copied it an pasted it in both devices.

Both routers have the newest firmware.

Any idea?

I can send on private e-mail more detail description and configuration with logs.

Will appreciate any help

With best regards

Mike