Does the network you're trying to connect to use a WEP key? If so, make sure that the WEP key you entered is correct. As far as I recall, the Jornada doesn't support WPA encryption, so make sure that's no enabled on the access point. And lastly, it's always worth it to try a soft reset to reboot the PDA.
-------------------- Lisa Gade Editor in Chief, MobileTechReview