Firebase custom domain shows up Unsupported Protocol flag in the browser

I’m trying to set up the Firebase hosting + Cloudflare DNS and DNS/LTS.
I’m receiving ERR_SSL_VERSION_OR_CIPHER_MISMATCH error on the browser.

This site can’t provide a secure connection
**** uses an unsupported protocol.

I’m using two Firebase projects to the same code project
In my another subdomain is working fine:

I set the SSL/TLS encryption mode to FULL, but still seen this issue.

A related topic here:

Hi @tyler.vortex,

Makes me think:


I got it. I changed to and now it’s working.

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