We experienced an issue with the update and the bug "IJ45281: Saving an LDAP repository can result in a nullpointerexception error causing login.conf file to go blank.". We updated with a blank login.conf wich ended in not being able to login to the GUI after the update. We replaced the blank login.conf from a different installation to be able to login to the Gui again. It might be a good idea to search on your system with locate for non-blank login.conf files and do a backup before starting the update.
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Martin Schmitt
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