VPN passthrough wndr3700

[lasikdr]

I just purchased the wndr3700 and cannot vpn from my iPAD or iPhone to my desktop at home. I was able to do this with DIR-655. I also can't vpn to home pc from laptop at work. Normally I would vpn to home pc and the use remote destop .
I have firewall on PC off, I use Wndows 7 Ultimate 64bit. I have these ports open
Turn port forwarding for the VPN ports: 50, 51,Turn on port 1723 for PPTP VPN's- used for PPTP control
I did this :Select WAN Setup > Advanced > Respond to Ping on Internet Port.
I also cannot use a remote desktop wyse program from iPAD to desktop.
Can anyone give detailed step by step instructions for this ?