R7000 Trying to Connec to to Office L2TP VPN

Hi,

Just put in the R7000 running on the Firmware V1.0.11.116_10.2.100 and struggling to get it to connect to a VPN that is running AS L2TP/IPsec with pre-shared key.

Now this all worked prior to swapping the R7000 in.

I can connect to othre VPNs ok but not if they are L2TP/IpSec.

I have gone into Advanced > Port Forwarding > + Add Custom Service and configured the following ports:

500

1723

1701

4500

Now I am not sure what to put in the Internal IP Address but I have set it to be the IP address of my Laptop as that is what I am trying to connect to?

Probably doing something either fundamentally wrong or the R7000 cant actually do what i need it to.  

Does anybody have any ideas / hints? I have spent hours today trying to get this to work?

Thank you :)