Comment 4 for bug 70690

This problem happened to me when I set up an webdavs share used an incorrect configuration on my server. Using this (incorrect) share, Firefox whould open the "davs://" URI. When I'd fixed the error however, nautilus opened the share like it should.

I suppose it could be that the server sends an error back over http, which causes nautilus to pass the error-page to Firefox.

If it helps, the error in my Apache2 config file was in the Alias directive:

...
Alias /shared "/var/www_dav_shared/"
<Directory /var/www_dav/shared>
...

Here the <Directory> points to the wrong location. In my browser the error was ignored, but Nautilus probably detected it.