Getting currently such errors:
Request from <ip> via cp1053 cp1053, Varnish XID 806912450 Error: 503, Backend fetch failed at Sat, 16 Sep 2017 16:27:34 GMT
I got them on following pages:
Wikimedia Commons Watchlist
https://meta.wikimedia.org/wiki/Special:GlobalRenameQueue/open
https://commons.wikimedia.org/wiki/File:Fars_iranin.jpg
(...)