Wake on lan working on and off?

[Dan5150]

Last night i setup my pc and my pc monitor android app to work over the internet and 3g. Last nite it worked flawlessly but this morning it would not wake up my home pc. I kept getting network offline error. I came home from work, booted up my pc and boom! it worked. Why is it inconsistent? I have port 9 udp forwared an im running windowd 7 ultimate with a netopia 3347-02 router/modem with att dsl. I am also using a dyndns static ip updater as well.

Thanks for any help

[Paul]

PC Monitor relies on the IP address that the computer had during it's last runtime. So if your IP Address changed when the computer with PC Monitor was offline he won't know you changed your ip address, thus Wake on Wan will fail.