Upgrade to Varnish 6.x which is Required for Magento 2.4.x
The current Cloudways Varnish version is 5.0.0-7+deb9u2
Magento 2.4.0 and 2.4.1 require Varnish 6.x
(see: https://github.com/navarr/magento2-supported-versions)
I know that you support Magento 2.4.0
(see: https://www.cloudways.com/blog/magento-2-4-upgrade/)
Currently, I'm running a Magento 2.3.5p2 instance and Vanish 6.x is compatible with this version as well as M2.4.x
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R Smith
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