WebDAV & Plesk 9.2

[ABACUS]

I did what is recommended in the forum at:
http://forums.cari.net/35-backup-soluti ... -plesk-84/

1. Using Plesk, I created a password protected directory.
2. Then I made a config file:
/var/www/vhosts/abacushost.net/conf/vhost.conf
which contains:
<Directory "/var/www/vhosts/abacushost.net/httpdocs/calendar">
DAV on
AllowOverride none
</Directory>
3. I restarted the web server

When I connect, it recognizes it as a WebDAV file system but I can't actually login. It gives the error:
"You cannot connect to this server because it cannot be found on the network. Try again later or try a different URL."

Any ideas as to what I'm doing wrong?