Error 503 Backend Fetch Fails Varnish Cache Server

Hi @Andrea_Segura I managed to get it working again!

What I done:

  1. Changed Varnish cache into Redis followed by this tutorial:

https://digitalstartup.co.uk/t/how-to-install-and-setup-redis-for-magento-2-ubuntu/

Very easy and quick, thanks to @digitalstartup!

  1. After Redis installation and enabling with Magento you won’t see page or admin because of the error.

You just need to set the mode: bin/magento deploy:mode:set developer

And switch back to production mode: bin/magento deploy:mode:set production

It will compile Magento again and deploy static content

  1. I also flushed and cleared the cache

bin/magento cache:flush
bin/magento cache:clean

And that’s it! You will be able to see your website again.

One thing. I didn’t check if step number 2 from above can sort out the problem before I switched to Redis. Maybe it also a way to sort it out? But with the Redis on board it’s no problem at all.

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