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Cisco Bug: CSCsg37835 - ACS: authentication failed when username in UPN format

Last Modified

Mar 12, 2016

Products (1)

  • Cisco Secure Access Control Server for Windows

Known Affected Releases

4.1(1.18) 4.2(0.1)

Description (partial)

While authenticating against ACS using MS-CHAP related protocols (as MS-PEAP) and PAP, and username presents in UPN format (e.g 
Authentication fails due to incorrect domain stripping. Such happens in situation when user information in active directory presents in such way:
user windows logon name is : 
pre-2000 name (SAM):

Here it is possible to see that UPN username part is different from SAM

Steps to reproduce:
1) Create MS-PEAP enviroment
2) Configure user in AD as specified above 
3) Try to authenticate, while providing username in UPN format (
4) Authentication will fail.

SAM username different from UPN username.
Applies to PAP/CHAP and possible to EAP-FAST authentications
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