Hmm, well, I've just tried it all again with the url:
Which worked find when I put it in as a URL, (a prompt to save the rss file appeared) but when I try in zimbra, I get the critical error message:
I've changed the url here of course, but I've been careful not to introduce any errors.
Content could not be retrieved. Make sure the following URL is a RSS/ATOM feed:
Could it be something to do with the use of port 88?
The server is set with a default domain and so users log in using only the prefix (user, as opposed to firstname.lastname@example.org) and I have used only the user name in the url.
It's running Zimbra 3.1.4 on Suse 10.0
Hate to admit this part but I dont know where to look for the stack trace (no message box with extra info appeared, I've seen these when there's a java error - so if you mean that part, then no, there was none)