Thread:Extension talk:RSS/RSS does not accept results of Semantic Mediawiki query (2)/reply (4)

the best way to check is to save the feed (the xml file) to a file on a server, and then to check if the Extension:RSS can actually read the file. There are thousands of reasons why this might not work as expected.

Try also to fetch the feed url on your wiki server manually using "wget" or "curl" and check the resulting file.