Attribute "User-Password" is required for authentication

I found a few topics on this issue but nothing quite informative enough. I'm trying to get freeradius auth working with pam and peap. When I test my config with radtest, I get Access-accept. When I use a windows XP supplicant with a 3com access point, I get: rlm_pam: Attribute "User-Password" is required for authentication. modcall[authenticate]: module "pam" returns invalid for request 4 modcall: leaving group authenticate (returns invalid) for request 4 auth: Failed to validate the user. Is the 3com not sending User-Password attributes in the packets, or is something else wrong?