Synching with WebDAV

[DaulRa]

So I've setup sync from my fedora workstation using WebDAV, and everything has uploaded correctly after the sync:

Went to my Windows PC, installed SP and tried to setup sync, pointing it to the same WebDAV instance/folder. No matter what, I keep on getting presented with this:

If I decide to Force Upload of Local Data (I have everything backed up) and go back to the first machine, surprise surprise, I get the same message on that one:

What's the secret to setting this up? Pointing it to the same folder doesn't seem to do the trick.
Using SP 13.0.10.

[johannesjo]

Related #4391