We noticed that KeePass doesn't use UTF-8 for encoding username and password in the WebDAV Basic Authentication. Users with non-ASCII Characters in their WebDAV password are therefore unable to authenticate. It looks like there is no definitive standard for which encoding to use, but all modern browsers (Chrome, Firefox, Internet Explorer) settled on UTF-8 by now. See also https://stackoverflow.com/a/7243567 Is it possible to change the encoding used by Keepass for the Basic Authentication?