RSS Feed Not Found – 404 Error

I am having the same issue with a podcast feed that was working fine before the WordPress 3.6.1 update. This is what I received from my web host support in regards to a diagnosis specific to our problem:

It appears the feed URL is providing a 404 error first, then proceeding to the RSS feed. I thought at first this might be because nginx isn’t following the WordPress’ rewrite rules for the RSS feed, but I flipped off static file processing with nginx in order to have everything processed by apache and ran into the very same issue.

My guess at this point is that the RSS feed plugin is attempting to override requests for “https://www.mountainviewbible.com/feed/podcast” via WordPress hooks that are supposed to be higher priority than the WordPress 404 fallback, but for some reason as of the latest update the priority is now wrong, causing the 404 to come before the RSS feed.

I have too this problem with my site feed :

https://www.ads-software.com/support/topic/removed-the-feed-from-the-new-version?replies=5

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I’ve installed WordPress over again. I even remove the plugins and without the plugins I tried but not working.

but my working in this url : https://bhiinsight.org/?feed=rss2

but dont working in true ulr : https://bhiinsight.org/feed/

why ??
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i solve my proble with this :

https://perishablepress.com/what-is-my-wordpress-feed-url/