Was able to find the solution. The URL now has to end with a slash "/".
** Changed in: evolution (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to evolution in Ubuntu. https://bugs.launchpad.net/bugs/1721752 Title: Evolution does not connect to caldav calender after update to 17.10 Status in evolution package in Ubuntu: Fix Released Bug description: Error message: The calendar backend servicing “xxx” encountered an error. The reported error was “Failed to issue REPORT: HTTP error code 404 (Not Found)”. Works with Thunderbird and Lightning ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: evolution 3.26.1-1 ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3 Uname: Linux 4.13.0-12-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.7-0ubuntu2 Architecture: amd64 CurrentDesktop: GNOME Date: Fri Oct 6 12:38:09 2017 EcryptfsInUse: Yes InstallationDate: Installed on 2017-08-02 (65 days ago) InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412) SourcePackage: evolution UpgradeStatus: Upgraded to artful on 2017-10-06 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/1721752/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp