I just updated the AD plugin with "install without restarting" turned on to attempt to fix bug 12619 which I originally reported.

It failed:

INFO: Starting the installation of Active Directory plugin on behalf of tfanning
01-May-2012 11:23:40 hudson.model.UpdateCenter$UpdateCenterConfiguration download
INFO: Downloading Active Directory plugin
01-May-2012 11:23:41 hudson.PluginManager dynamicLoad
INFO: Attempting to dynamic load C:\Program Files\Jenkins\plugins\active-directory.jpi
01-May-2012 11:23:41 hudson.model.UpdateCenter$DownloadJob run
SEVERE: Failed to install Active Directory plugin
hudson.util.IOException2: Failed to dynamically deploy this plugin
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1137)
at hudson.model.UpdateCenter$DownloadJob.run(UpdateCenter.java:955)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: Unable to delete C:\Program Files\Jenkins\plugins\active-directory\WEB-INF\lib\active-directory-1.0.jar
at hudson.Util.deleteFile(Util.java:237)
at hudson.Util.deleteRecursive(Util.java:287)
at hudson.Util.deleteContentsRecursive(Util.java:198)
at hudson.Util.deleteRecursive(Util.java:278)
at hudson.Util.deleteContentsRecursive(Util.java:198)
at hudson.Util.deleteRecursive(Util.java:278)
at hudson.Util.deleteContentsRecursive(Util.java:198)
at hudson.ClassicPluginStrategy.explode(ClassicPluginStrategy.java:389)
at hudson.ClassicPluginStrategy.createPluginWrapper(ClassicPluginStrategy.java:113)
at hudson.PluginManager.dynamicLoad(PluginManager.java:340)
at hudson.model.UpdateCenter$InstallationJob._run(UpdateCenter.java:1133)
... 7 more

I then restarted the Jenkins service, waited, logged in with my AD credentials, so this appeared to work.

However in Jenkins my AD account has now lost all of its admin privileges, i.e. I nor any other person configured to have admin rights can now configure Jenkins.

I noticed active-directory.bak left over in the Jenkins plugin folder. Stopped the service, deleted active-directory.jpi, renamed active-directory.bak to .jpi, restarted, all working (albeit with bug 12619 still present)

How should I upgrade to 1.27 safely?