Windows – Laptop connects to wireless network but gets invalid ip

windows xpwireless-networking

My laptop's wireless randomly stopped working.
I'm in a hostel in Sydney, everyone in the house is connecting just fine, however my laptop is connecting to the wireless network but getting an "Invalid IP" and the icon has that yellow exclamation mark.

I went to a McDonalds this morning to try the wifi there and it connected just fine.
I also tried restarting the router, same thing.

Any ideas on what might be wrong?

Thanks in advance!

Best Answer

Check your credentials and wireless setup. Make sure you have the correct passphrases/key and the correct encryption e.g. WPA or WPA2 or whatever it's using. It must match the router.

I'm fairly sure it's just connecting at the wireless level but not authenticating so therefore it's not able to communicate with the DHCP server but just self assigning an address.