Thread:Extension talk:WikiArticleFeeds/RSS displayed on the wiki, but failed to load on a RSS reader/reply (3)

You wrote:

Yes, the feed generator is on an intranet server.

Most likely your server - and therefore also the RSS extension of your wiki which I suppose is also in this intranet - uses a proxy for accessing content from outside, i.e. internet.

Set the proxy settting of your Firefox to "Auto detect" proxy.