We have a problem on our site with Smush CDN. The images are not showing up and they return a 503 error. If you open the direct address of any image, they return the following error:
Error 503 Backend fetch failed Backend fetch failed Guru Meditation: XID: 554206404 Varnish cache server
The site is hosted with WPMU DEV hosting and we don’t have any caching plugins on the site. Please advise.