Error 503 Backend fetch failed Guru Meditation: XID: 45654 Varnish cache server in magento2

varnish

we are using MAgento 2.1 and elastic suite ,rediss cache and varnish cache 4

so we have 60 K products in our site and recently we updated attribute in magento2 admin from that day onwords we are getting error like 

Error 503 Backend fetch failed
Backend fetch failed
Guru Meditation:
XID: 45654
Varnish cache server

so we updated varnish config with below :

-p http_resp_hdr_len=65536 \
-p http_resp_size=98304 \

but the error is the same. How can we fix it?

Best Answer

This error indicates that Varnish can't get a HTTP response from your backend; specifically it's having trouble connecting to your backend webserver, nginx or apache.

Can you copy your varnish default.vcl file?

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