IP sec config in subnet

I have RUT200 up and running with 4g SIM card.
IPsec configured and works fine via 4g. Now there is Wired connection available in
premises and I would like to take 4g sim away.
I am having troubles configuring RUT200 IP sec.
When I try to connect from RUT200 WAN network using same IPsec credentials and RUT200 WAN IP-aaddress( then it works.
When I try to connect via new routers WAN IP ( then connection times out.
In new router I did port forwardings for VPN and IPsec related ports. This didnot help. After that I did DMZ and assigned RUT ip.
Still no succses.

Little picture :