Unknown user or bad password while using Free RADIUS PAM

[Shteinberg-hirik, Jenny (Jenny)]

Hi,
 
We use Free Radius PAM_RADIUS_AUTH (version 1.3.16) intergrated into
Linux from WindRiver distribution based on kernel 2.6.10
As Radius Server we use Internet Authentication Server from Win2000
Server.
 
We can not receive authentication for user defined on the Radius Server.
Here the Warning that is logged on the Radius Server for this event:
 
User slb was denied access.
 Fully-Qualified-User-Name = KERNEL\slb
 NAS-IP-Address = 127.0.0.1
 NAS-Identifier = check
 Called-Station-Identifier = <not present> 
 Calling-Station-Identifier = 135.64.103.49
 Client-Friendly-Name = 149.49.76.121
 Client-IP-Address = 149.49.76.121
 NAS-Port-Type = Virtual
 NAS-Port = 16015
 Policy-Name = <undetermined> 
 Authentication-Type = PAP
 EAP-Type = <undetermined> 
 Reason-Code = 16
 Reason = There was an authentication failure because of an unknown user
name or a bad password.  
 
Using the same PAM_RADIUS_AUTH installed on VMware Player (version
1.0.1)  enables us receive authentication for the same user. Here the
Information that is logged 
on the Radius Server for this event:

User slb was granted access.
 Fully-Qualified-User-Name = KERNEL\slb
 NAS-IP-Address = 127.0.0.1
 NAS-Identifier = check
 Client-Friendly-Name = 135.64.102.130
 Client-IP-Address = 135.64.102.130
 NAS-Port-Type = Virtual
 NAS-Port = 24935
 Policy-Name = GAdmin
 Authentication-Type = PAP
 EAP-Type = <undetermined>
 
Both Radius clients (  for Linux and for VmWare) are configured
absolutely identical on the Radius Server. The same user, same password
and the same shared secret are used. 
What can be the problem?
 
 
Thank you,
 
Jenny
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