IAS Authentication rejected for existing users

I have the same issue as in following question

http://www.experts-exchange.com/Networking/Security/IPSec/Q_22844878.html?sfQueryTermInfo=1+account+ad+authent+exist+failur+radiu

However, I still have the same issue. I have tried the all the steps above but still not working. Following is what I get when successful

User tst@example.com was granted access.
 Fully-Qualified-User-Name = example.com/OU/tst
 NAS-IP-Address = 192.168.240.6
 NAS-Identifier = <not present>
 Client-Friendly-Name = PIX
 Client-IP-Address = 192.168.240.66
 Calling-Station-Identifier = <not present>
 NAS-Port-Type = Virtual
 NAS-Port = 324
 Proxy-Policy-Name = Use Windows authentication for all users
 Authentication-Provider = Windows
 Authentication-Server = <undetermined>
 Policy-Name = PIX
 Authentication-Type = PAP
 EAP-Type = <undetermined>

Following when unsuccessful

User test1@example.com was denied access.
 Fully-Qualified-User-Name = example\test1
 NAS-IP-Address = 192.168.240.6
 NAS-Identifier = <not present>
 Client-Friendly-Name = PIX
 Client-IP-Address = 192.168.240.66
 Calling-Station-Identifier = <not present>
 NAS-Port-Type = Virtual
 NAS-Port = 324
 Proxy-Policy-Name = Use Windows authentication for all users
 Authentication-Provider = Windows
 Authentication-Server = <undetermined>
 Policy-Name = PIX
 Authentication-Type = PAP
 EAP-Type = <undetermined>

What is interesting is when I create a user account (username) on AD with Upper case authentication fail. However, same with lower case authetication successful. Even for existing accounts.
   

LVL 6
davbouchardAsked:
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davbouchardConnect With a Mentor Author Commented:
Issue resolved by configuring the attributes $ to @domain.com
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peterellisCommented:
davbouchard:,
I have got the same issue as yourself about being denied access due to authentication.
Can you explain in detail what you mean by 'configuring the attributes $ to domain.com'??
What steps did you perform to get authentication to work??
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