Cloudflare SSL generated certificates don't work

Website, Application, Performance Security
1

What is the name of the domain?

subdomain.example.com

What is the error message?

Failed to connect to the secure server address

What is the issue you’re encountering

Cloudflare SSL certificates don’t work, need to use server’s own certificates

Was the site working with SSL prior to adding it to Cloudflare?

Yes

What is the current SSL/TLS setting?

Full (strict)

What are the steps to reproduce the issue?

My server uses LetsEncrypt certificates and works fine everywhere, either opening from browser or connecting via Nexctloud client.

Right after proxying traffic to it via Cloudflare website I see some unrecognized and untrusted certificate:
Common Name (CN) WE1
Organization (O) Google Trust Services
Organizational Unit (OU)

Nextcloud client cannot connect to the server anymore, getting connection error and complaining about this broken Cloudflare’s certificate.

2

If you want anyone to be able to help you, you’d have to share your actual domain or more details about the certificate that is presented to you.

1 Like
3

I cannot provide domain name for privacy purposes. What other certificate information would help you?

4

As a bare minimum, the whole certificate chain that doesn’t work for you.

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6

That looks like a successful handshake to me. Is the device on which you are having problems very old? Or is this from the same device that you’re having problems with?

Also, your domain is included in the raw certificate, so you might want to edit that out to keep your domain secret.

1 Like
7

Hello. I was able to resolve the issue by enabling Universal SSL and also updating the proxy redirect address in the Nginx config.

8

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