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FWIW it seems that the single label isn't checked if the server is auto-discovered. I did a quickie server install using EXAMPLE as the realm and example as the domain by disabling the check. I then was able to enroll a client against it using auto-discovery. Manually providing domain and realm options fails with the single label error.
package version:
rhel-6.10 : ipa-server-3.0.0-51.el6.x86_64
rhel-7.8 : ipa-server-4.6.6-5.el7.x86_64
Based on comment#15 and comment#16, marking the bug as verified.
Comment 20Florence Blanc-Renaud
2019-11-28 08:52:48 UTC
Hi,
This issue has been fixed in RHEL 7.8 beta that is already available for download.
To request a backport to RHEL 7.7, please contact your support channel and provide additional business and/or technical details about its importance to you.
I have been using a single label domain in an isolated HPC setup (freeipa+warewulf/diskfull and diskless/centos7) since 7.3. Most of our nodes have been installed and enrolled into freeipa managed with a single label domain. I have just be bitten by this regression(?) when adding a clean new desktop machine from 7.7. Of course, one can workaround it by downgrading the *ipa* packages to the 7.6 point release, enroll and upgrade... If the patch is not too invasive, I would like to have it backport (or just state wont-fix|wait for 7.8 at https://access.redhat.com/solutions/4369521).
Comment 22Florence Blanc-Renaud
2019-12-05 18:46:54 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:1083