The module doesn't accept MSN trackback urls

Hello, I wrote a blog entry and wanted to add this trackback :
http://spaces.msn.com/members/icf/blog/cns!1p5fCQvtw9Jbt4oD01rKZX8w!268....

but when I submit the content is not posted and the text area for trackbacks is outlined in red, so I guess the trackback module doesn't like either the URL or because it can't reach it, but when I enter the url in my browser (firefox) everything is ok, I receive an error message but as usual it's about me not giving the url all the arguments that should go with it.
I mean the error message is quite like all other trackbacks urls when you put it directly in the browser's address bar.

Thank you if you understand my english and act upon this bug or just tell me it's not a bug.

Cheers,