Copilotfree, in-browser
Ask me anything about your lessons or your code.
“What is a port?” · “Why is my code erroring?”
Ask me anything about your lessons or your code.
“What is a port?” · “Why is my code erroring?”
The first message of a TCP connection, meaning 'I would like to talk'. A reply proves something is listening, which is exactly what a port scanner is looking for.