Welcome to the forums,
Does your server use a non-standard port? So you would enter like: mailserver.domain.com:#
Or only http only? (uncheck 'Use Secure Connection')
Though usually these are shown by 'unable to connect errors' - your error seems like it just didn't get a reply after attempting to auth, but I don't know if you're using a prior version.
You can check on the Toaster exe & dll's which have version numbers. (The installer doesn't show a version yet.)
If you don't know how to check those locations:
Did you get this along with
zimbra desktop alpha or via your server downloads page?
If you're an admin, via the command line:
Code:
su - zimbra
zmcontrol -v
or in the main search bar of the advanced (ajax) web-client enter:
Then simply go to>
http://www.zimbra.com/forums/profile.php?do=editprofile > about halfway down the page 'additional information' > zimbra version blank - to update your forum profile so we're not always asking
While it will still need a browser window open to operate, if you use firefox you might also try the
ZimbraCheck Firefox Extension