Hi @cjehanno!
The best way to reach the administrators of public Galaxy servers that are not hosted under a URL like usegalaxy.* is by contacting them directly. Most do not check this forum and all Galaxy servers are independent.
Where to find contact info: Usually the home page of the server has contact information, and many also list support resources here: https://galaxyproject.org/use/
The Cistrome server’s hub page: https://galaxyproject.org/use/cistrome-analysis-pipeline/. Includes a link to their Google Group.
When I checked the group, I found a post from two days ago about others also noticing the server problems. I would suggest following this for updates: https://groups.google.com/forum/#!topic/cistrome/TADFSl5D26Y
Hope that helps!