All RSS Feeds Across Network Are Gone

We recently noticed that every single site in our network has lost its RSS feed. No feed exists at or any other site on the network. We first noticed it because we're using Ultimate Branding's option of Dashboard Feeds and I first noticed a feed widget on a dashboard returning this:

RSS Error: A feed could not be found at A feed with an invalid mime type may fall victim to this error, or SimplePie was unable to auto-discover it.. Use force_feed() if you are certain this URL is a real feed.

I've tried everything I can think of (such as checking php closures and stuff). I'm not sure what SimplePie is referring to. The only thing I can think of now is that this was noticed within a week of moving our whole network to a new server. Not sure why all the feeds would have gone missing, but I can't think of any other change that we've made that would do this. Any ideas? I'll go ahead and open the Support portal for the network.