https://pt.wikipedia.org/wiki/Especial:Diferen%C3%A7as_entre_edi%C3%A7%C3%B5es/48940476

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Request from 177.34.141.186 via cp1053 cp1053, Varnish XID 785383956
Error: 503, Backend fetch failed at Sat, 16 Sep 2017 16:29:41 GMT

Other pages I opened recently included the following instead of the last two lines:
https://pt.wikipedia.org/wiki/Especial:Diferen%C3%A7as_entre_edi%C3%A7%C3%B5es/49673944

Request from 177.34.141.186 via cp1053 cp1053, Varnish XID 829129221
Error: 503, Backend fetch failed at Sat, 16 Sep 2017 16:29:33 GMT

and
https://pt.wikipedia.org/wiki/Especial:Diferen%C3%A7as_entre_edi%C3%A7%C3%B5es/49683685

Request from 177.34.141.186 via cp1053 cp1053, Varnish XID 755042630
Error: 503, Backend fetch failed at Sat, 16 Sep 2017 16:29:34 GMT