Annoying VPN Issue

Hi Everyone,

I get error 721 (Remote computer did not respond) whenever I try
connecting to my XP machine at home through vpn.

The server machine is behind a D-Link(di-624) router and the client is
behind a Linksys(WRT54G) router. I checked both routers to ensure that
IPSec, PPTP and L2TP Passthrough were enabled and they indeed are. On
the server side, ports for the IPSec and PPTP are forwarded to the
correct machine as well. The funny this is that the first 2 times I
tried this, the connection worked flawlessly!. After the second
connection, I opened a remote desktop connection to the server and
after that I started getting the error message. Am I missing something?

I restarted both machines, removed and readded connections on both
sides and still no change. I checked the dlink log and the only odd
thing i notice is that I keep getting messages like this "Smurf Attack
Detect 192.168.0.1:8 192.168.0.1:0 Packet Dropped"

Any help would be greatly appreciated!

Thanks,

Moe