The local port number for this specific TCP connection table entry. Combined with tcpConnLocalAddress, this identifies exactly which local service, by well-known or configured port, a given connection belongs to, how an admin walking the connection table distinguishes an SSH management session from an API connection without needing shell access to the box. Example: spotting an established connection with tcpConnLocalPort 22 from an unrecognized remote address is the kind of entry that would prompt investigating an unexpected SSH session.