I want to connect to an OwnCloud WebDAV drive. I tried
and get asked for my credentials. But usually it doesn't accept my username and password despite the pair is entered correctly. But - and that is strange - sometimes it works (oh really!). But even then it's crippling slow despite a fast server and connection. For me it seems Windows Explorer has a Problem that my server cannot use port 80 for WebDAV. Is that true?