How to close 8443,8080 port

Hello,

When I do domain scanning on the domain name, I get the information that ports 8080,8443 are open.our customers complain that this port is open.although I have setup WFA, it still shows it as open.how can I close these ports?

You cannot. The WAF rule (something like not (cf.edge.server_port in {80 443})) will block all requests to all non-standard ports, but you cannot close them.

If you are subject to PCI DSS or similar audits, your auditor should understand that any risk has been mitigated.

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Can you tell me for which reason Cloudflare uses the above ports?

They are common alternate ports for HTTP and HTTPS services.

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As @i40west said they are common ports and Cloudflare offers HTTP/S on a lot of ports. You can find the full list here:

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