Site proxied by Cloudflare tunnel, worked fine all these days but today

What is the name of the domain?

pos.plutokm.com

What is the error message?

This site can’t be reached .. ERR_QUIC_PROTOCOL_ERROR

What is the issue you’re encountering

some Nodes with Google Chrome are giving ‘This site cant be reached’ with ERR_QUIC_PROTOCOL_ERROR

What steps have you taken to resolve the issue?

We have enabled QUIC in firewalls at each of our store locations where this browser error happened.

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

No

What is the current SSL/TLS setting?

Full (strict)

What are the steps to reproduce the issue?

Some locations, Google chrome on ubuntu , we are getting this error

Screenshot of the error

To address this issue, you can navigate to the Speed > Optimization > Protocol Optimization and disable HTTP/3 (with QUIC):

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