Hi,
I tried to add https://ronjeffries.com/feed.xml to Newsblur and noticed that it has been failing to fetch for a while (https://newsblur.com/site/7366/ronjeffries.com) but when I try to load the file in my browser it loads fine. Similarly, it loads fine when I try to cURL it from my machine.
I tried the options under fix a misbehaving site but got that an unhandled exception was thrown.