Unable to submit podcast feed - error is Bad http result code 504
I'm trying to submit my podcast for the first time to iTunes, and am unable to move past the feed submission screen.
I am attempting to submit this feed: http://derbyface.com/feed/podcast
I get an error saying:
We had difficulty reading this feed. Bad http result code 504
My site is hosted at HostGator, I'm hoping it's not an issue with my server. Do you have any ideas for what I could try? Thanks!!
-emiLy
MacBook Pro (13-inch Mid 2012), OS X Yosemite (10.10.4)