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https://issues.jenkins-ci.org/browse/JENKINS-12607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=162515#comment-162515
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Kohsuke Kawaguchi commented on JENKINS-12607:
---------------------------------------------
The regression was that various code in Jenkins actually persists the user name
(such as the matrix security.) So any kind of automatic canonicalization
results in name mismatch, resulting in a loss of permissions.
The proper fix needs to be in the core where SecurityRealm would decide whether
the username/groupname is case sensitive.
> Active directory user names should not be case sensitive.
> ----------------------------------------------------------
>
> Key: JENKINS-12607
> URL: https://issues.jenkins-ci.org/browse/JENKINS-12607
> Project: Jenkins
> Issue Type: Bug
> Components: active-directory
> Affects Versions: current
> Environment: Windows Server 2008.
> Reporter: Paul M
> Priority: Minor
>
> Active directory user names should not be case sensitive. For example if I
> add the user "paul" then I would expect to be able to also login as "Paul",
> "pAul" or any other case combination.
> At the moment this won't match any user name and fail to login the user in,
> or worse match none and apply "authenticated user" permissions. This seems to
> confuse a lot of users.
> If there is a use case where case sensitivity is required then I think there
> should be a toggle option to enable or disable it.
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