Looking for logging into the Horde Update Caldav Failure 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 Horde Update Caldav Failure site. After that you can login as usual with your login credentials.
https://oli.new-lan.de/2015/02/plesk-12-mit-horde-5-2-caldav-webdav-authentication-failed/
https://forums.cpanel.net/threads/problem-connecting-to-caldav.605747/
https://sourceforge.net/p/outlookcaldavsynchronizer/tickets/437/
https://sourceforge.net/p/outlookcaldavsynchronizer/tickets/540/
https://talk.plesk.com/threads/calender-sync-between-horde-and-thunderbird-fails.340760/
https://help.univention.com/t/horde-verweigert-periodisch-login/7610
https://forums.crackberry.com/blackberry-10-os-f269/there-one-way-syncing-horde-caldav-929846/
https://forums.bitfire.at/topic/688/horde-sync-fails-with-error-401-unauthorized-since-davdroid-0-8-1
https://bugzilla.mozilla.org/show_bug.cgi?id=1063068
https://caldavsynchronizer.org/de/hilfe/dokumentation/
https://community.spiceworks.com/topic/1970792-cpanel-calendar-sync-to-outlook-clients
https://www.horde.org/apps/kronolith/docs/CHANGES
https://github.com/aluxnimm/outlookcaldavsynchronizer