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The first line some services send as soon as you connect, naming the protocol, program and version, like SSH-2.0-OpenSSH_9.6p1. Anyone can read it, so it tells everyone what runs where.
The first line some services send as soon as you connect, naming the protocol, program and version, like SSH-2.0-OpenSSH_9.6p1. Anyone can read it, so it tells everyone what runs where.