Cannot Authenticate Login to CUPS for doing Admin Tasks

[Anurag]

Dear CUPS Team,

When doing any admin task on the printer through the CUPS Interface(http://localhost:631), we are prompted for the user ID and Password. But no matter what we enter(including root or any other user's credentials) the CUPS Interface is not accepting the User/Password. The User/Password keeps popping up as if the entered credentials were wrong (even when they were correct). End of this message has the config file for CUPS that we are using.
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Red Hat Enterprise Linux Server release 5.5 (Tikanga)
Kernel 2.6.18-194.8.1.el5 on an x86_64
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yum info cups.x86_64
Loaded plugins: rhnplugin, security
Installed Packages
Name       : cups
Arch       : x86_64
Epoch      : 1
Version    : 1.3.7
Release    : 18.el5_5.7
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MaxLogSize 2000000000
# Show troubleshooting information in error_log.
LogLevel debug
SystemGroup sys root
# Allow remote access
Port 631
Listen /var/run/cups/cups.sock
# Enable printer sharing and shared printers.
Browsing On
BrowseOrder allow,deny
# (Change '@LOCAL' to 'ALL' if using directed broadcasts from another subnet.)
BrowseAllow @LOCAL
BrowseAddress @LOCAL
DefaultAuthType Basic
<Location />
  # Allow shared printing and remote administration...
  Order allow,deny
  Allow @LOCAL
</Location>
<Location /admin>
  Encryption Required
  # Allow remote administration...
  Order allow,deny
  Allow @LOCAL
</Location>
<Location /admin/conf>
  AuthType Default
  Require user @SYSTEM @OWNER
  # Allow remote access to the configuration files...
  Order allow,deny
  Allow @LOCAL
</Location>
<Policy default>
  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job CUPS-Move-Job>
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After CUPS-Accept-Jobs CUPS-Reject-Jobs>
    AuthType Default
    Require user @SYSTEM
    Order deny,allow
  </Limit>
  <Limit CUPS-Authenticate-Job>
    Require user @OWNER @SYSTEM
    Order deny,allow
  </Limit>
  <Limit All>
    Order deny,allow
  </Limit>
</Policy>

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Kindly help me out here.

Regards,
Anurag