mTLS not working for Cloudflared tunnels

Website, Application, Performance Security
1

What is the name of the domain?

brightsoft.pl

What is the issue you’re encountering

mTLS is not working when enabled for hosts created by Cloudflared tunnel

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

No

What is the current SSL/TLS setting?

Off

What are the steps to reproduce the issue?

  1. Create Cloudflared tunnel
  2. Add public host-name
  3. Verify it’s accessible
  4. Add host to SSL/Client certificate/Hosts
  5. Create mTLS WAF rule to block when host is from point 2 and certificate verification is false
  6. Curl with client certificate
2

Does the certificate have one of the allowed signature algorithms?

The certificate must use one of the signature algorithms listed below:

Allowed signature algorithms

x509.SHA1WithRSA

x509.SHA256WithRSA

x509.SHA384WithRSA

x509.SHA512WithRSA

x509.ECDSAWithSHA1

x509.ECDSAWithSHA256

x509.ECDSAWithSHA384

x509.ECDSAWithSHA512

3

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