Board Thread:Support Requests - Getting Started/@comment-44310720-20191106050053/@comment-44310720-20191108071320

Here:

https://community.bitnami.com/t/varnish-cache-server-error-503-backend-fetch-failed/59928

https://community.magento.com/t5/Magento-2-x-Programming/Error-503-Backend-fetch-failed-Varnish-cache-server/td-p/110320

There are just users who has got the error on outside of Fandom.