Error message in RSS widget


i'm tring to use tag feed plugin, i installed "post indexer" plugin (i have in my database the two tables wp_site_posts and wp_term_counts) then i uploaded "tag feed.php" on wp-content folder and the i copied the url of my feed for tag "cinema" (i have just one post cause i'm at the begin) "" in the default "RSS widget reader" of WP (i'm using 3.2.1), but it give me this message: "Errore RSS: WP HTTP Error: Recv failure: Connection reset by peer" ... i wrong something? can u help me plese??