521 error on Google Cloud Platform VM Instance


I am working on a website which is installed using Google Cloud on an vm-instance. On the site I’ve running WordPress, and that was working fine until adding Cloudflare to it.

The website is: https://allgoodwedding.com with IP-adress

Suddenly, I am receiving a 521 error. I’ve read about this error on different topics such as https://community.cloudflare.com/t/error-521-on-google-cloud-platform-vm-instance/90311

However, I am not really sure how to whitelist the IP-addresses of Cloudflare on my vm-instance.
Anyone who has any experience with this? If you have any questions, please ask. Thanks already!

Well, the message is quite clear about the issue.

Your server seems to be down -> http://sitemeer.com/#

Sometimes the most simple errors are to be overlooked. Thanks for this, made a small mistake and everything works fine now.

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