Anybody knowing what's up with the docwiki server? It throws Varnish https://en.wikipedia.org/wiki/Guru_Meditation errors

Anybody knowing what's up with the docwiki server? It throws Varnish https://en.wikipedia.org/wiki/Guru_Meditation errors 
https://www.dropbox.com/s/53kdynrvv5okdib/Screenshot%202015-10-15%2012.17.15.png?dl=0