Looking for logging into the Otrs Update 5 To 6 Broken site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Otrs Update 5 To 6 Broken site. After that you can login as usual with your login credentials.
https://groups.google.com/forum/#!topic/otrs_archive/DqqcQwsgtCM
https://doc.otrs.com/doc/manual/admin/5.0/de/html/upgrading.html
https://doc.otrs.com/doc/manual/admin/6.0/en/html/updating.html
https://community.otrs.com/release-notes-otrs-6-patch-level-16/?lang=de
https://community.otrs.com/release-notes-otrs-5s-patch-level-30/?lang=de
https://www.ictforce.be/2017/otrs-upgrade-5-to-6/
https://ftp.otrs.org/pub/otrs/doc/doc-admin/6.0/en/pdf/otrs_admin_book.pdf
https://phabricator.wikimedia.org/T74109
https://www.howtoforge.com/tutorial/how-to-install-otrs-on-centos-7/
https://forums.otterhub.org/viewtopic.php?t=39148
https://de.wikipedia.org/wiki/Open_Technology_Real_Services
https://github.com/zammad/zammad/issues/1713
https://www.znuny.com/de/#!/addons