Strange problem - when my wi-fi on my home PC is unlocked I can connect with my N900 downstairs no problem.

However I prefer to have a WAN lock on it

When I enter the code I always get the error on my N900 stating:

Internet connection failed
Unable to retrieve IP address from Server
Try again?

I have tried selecting WPA with a pre-shared key instead of WAN - still the same problem.

The strange thing is - it was working the other day - now it isnt!