![]() ![]() MAIL FROM and RCPT TO), debugging connections usually provide a much more intimate sort of interaction with the app you’re connecting to. Unlike an email server, however, which accepts requests relating to message delivery (e.g. In the same way that an email server usually listens on TCP port 25, waiting for remote email clients to “call in” over the network and request permission to deliver incoming messages, debugging ports listen on a port of their own choosing (often configurable, though sometimes only in an undocumented way) for incoming connections that want to issue debug commands. A “debugging port” typically refers to a listening network connection, usually a TCP socket, that handles debugging requests.
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