Windows was unable to log you on to network

[chicagotech]

Situation: The Enterprise wireless was working fine yesterday. But no one can't use it.

Cause: Certificate is expired. The Certification serve also receives this message:

Event Type: Warning
Event Source: IAS
Event Category: None
Event ID: 2
Date: 9/22/2010
Time: 11:20:55 AM
User: N/A
Computer: wireless
Description:
User chicagotech\BLin was denied access.
Fully-Qualified-User-Name = chicagotech.net/Users/Bob Lin
NAS-IP-Address = 10.0.30.64
NAS-Identifier = ADMIN_64_AP1231_F1
Called-Station-Identifier = 001e.f76f.5150
Calling-Station-Identifier = 001f.3b67.30a3
Client-Friendly-Name = AP1231IP64
Client-IP-Address = 10.0.30.64
NAS-Port-Type = Wireless - IEEE 802.11
NAS-Port = 1776
Proxy-Policy-Name = Use Windows authentication for all users
Authentication-Provider = Windows
Authentication-Server = <undetermined>
Policy-Name = All
Authentication-Type = PEAP
EAP-Type = <undetermined>
Reason-Code = 262
Reason = The supplied message is incomplete. The signature was not verified.

...€