problem to get different VPN running

I have a problem to run 2 different VPN to the same gateway.

I have a ASG120 with 2 external IP-adresses (for example 111.111.111.111 and 222.222.222.222) and 1 gateway from my counterpart (for example 333.333.333.333).

I have one VPN (1) running from my interface1 (111.111.111.111) to my counterpart´s interface (333.333.333.333). This works perfect, not any problems!!

Now I want to run a backup VPN (2) between my interface2 (222.222.222.222) and my counterpart´s interface (333.333.333.333). I turn off VPN1 and start VPN2, but it won´t work!! The live protocol doesn´t show any errors or failure messages!!

Can anybody help me with this problem? I have no idea why the VPN2 will not run. :(