Simplepie not returning a specific feed

I have SimplePie running on my website. It works for all RSS feeds I and the sites users have tried, except : http://investors.engilitycorp.com/corporate.rss?c=251345&Rule=Cat=news~subcat=ALL

The return is empty.

I don't see anything different than all the other feeds.

I was hoping someone might have a suggestion on were to look for a reason/fix.

Thanks