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Yes, using the DNS-01 or TLS-ALPN-01 challenge. However, Certbot does not include support for TLS-ALPN-01 yet. If you’re using any Certbot with any method other than DNS authentication, your web server must listen on port 80, or at least be capable of doing so temporarily during certificate validation. networking - What is DNS Delegation? - Server Fault This DNS service has to be visible from anywhere on the internet, and not be firewalled (that is port 53 udp and tcp inbound have to be allowed). Also your service provider must not block that port either (which some providers do block inbound traffic destined to those ports). TCP and UDP Ports Explained - BleepingComputer If it uses the UDP protocol to send and receive data, it will use a UDP port. Figure 1, below, is a represenation of an IP address split into its many TCP and UDP ports. Note that once an What port to use when DdoSing - Answers

In computer networking, the multicast DNS (mDNS) protocol resolves hostnames to IP addresses within small networks that do not include a local name server.It is a zero-configuration service, using essentially the same programming interfaces, packet formats and operating semantics as the unicast Domain Name System (DNS).

Why does DNS use UDP and not TCP? - GeeksforGeeks

Apr 19, 2020

Which TCP ports does a workstation use to authenticate to May 31, 2011