wordpress :Error 503 Backend fetch failed Varnish cache server

Today , I found my wordpress site can not display correctly .

like the picture show below


if you google this problem , u will find lots discussion there .
What if you try every possible workout but not work ?
disable plugins , disable theme …. bla bla , I evne reinstalled wordpress …. problem remained .

Especially , I DO NOT HAVE VARNISH INSTALLED !!

Guess what ? I switch to my cell phone’s wi-fi hotspot , BOOM ! error message disappear !! Can’t believe it is because ISP or router … wasted lots of time huh.

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