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Description of problem:
System -> Administration -> Users and Groups allows to add a user that already exists under ipa/sssd

Version-Release number of selected component (if applicable):
gnome-desktop-2.28.2-11.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. Install ipa-client
2. the ipa-server has a user named "yubikeyuser"
3. Try to add a local user on the client machine with the same name using the User/Group UI

Actual results:
User is added successfully

Expected results:
The user add attempt should fail with appropriate error messages.

Additional info:
I noticed this though

# useradd yubikeyuser
useradd: user 'yubikeyuser' already exists

Red Hat Enterprise Linux 6 is in the Production 3 Phase. During the Production 3 Phase, Critical impact Security Advisories (RHSAs) and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available.

The official life cycle policy can be reviewed here:

http://redhat.com/rhel/lifecycle

This issue does not meet the inclusion criteria for the Production 3 Phase and will be marked as CLOSED/WONTFIX. If this remains a critical requirement, please contact Red Hat Customer Support to request a re-evaluation of the issue, citing a clear business justification. Note that a strong business justification will be required for re-evaluation. Red Hat Customer Support can be contacted via the Red Hat Customer Portal at the following URL:

https://access.redhat.com/