Just transferred DNS records to Cloudflare. All sites are now down

Website, Application, Performance DNS & Network
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Within minutes of transferring to Cloudflare nameservers, I was alerted that my sites were down. I checked and get a message from Cloudflare that there is a host error, that the web server is not returning a connection. Checking the Cloudflare diagnostic center shows me several errors, including DNSSEC and others. The one that seems to me to be the key error is this:

  • HTTPS Status is “No, your request failed with a response status of 400 or above.”

I assume it just means the site appears down.

If I use a remote machine with a hosts file (circumventing Cloudflare), the sites are up.

I use a firewall plenty of people use. I can’t think of a reason it would block client traffic from Cloudflare. Google searches don’t show others having this issue.

Right now, the sites are hosted at a residence. Searches for the ISP possibly blocking Cloudflare client traffic don’t show anything.

What about my setup can I check?

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Before you added the site(s) to Cloudflare, were they working with a regular HTTPS connection to the hostname?

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They were. They still are, if I use a hosts file to make a machine think the old dns entries are still there.

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This may be the most likely cause. You’d have to open a ticket and ask Support to test their connection to your IP address.

To contact Cloudflare Customer Support, login & go to https://dash.cloudflare.com/?account=support and select get more help. If you receive an automatic response that does not help you, please reply and indicate you need more help.

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5

It looks like the issue was that the Cloudflare setting for SSL/TLS encryption mode was set to Flexible, instead of Full (strict).

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