The regular maintenance of UCS 4.1 ended at April 5th.
Users who still using UCS 4.1 should update to a more current version of UCS to get further security updates, bugfixes and minor-releases. To update to UCS 4.3 you have to change to UCS 4.2 first. A description of the necessary steps to update you could find in the release notes of UCS 4.2.
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