RSS Disappeared!

Hi there!
I experienced a weird behaviour of my WP 1.5 installation.
My RSS feeds stopped to work after I’ve posted (and then deleted) a password protected post.
I get a totally blank page…
I don’t know if the two things (pwd-post and blank-rss) are connected, but it’s a sort of coincidence.
Any idea or suggestion about?
My blog is https://www.totanus.net/ (italian language)
The feeds worked until this post: https://www.totanus.net/pure-mia-moglie/
I’ll be grate to anyone will help me… Thankyou

Matteo