The meaning of state in netstat
State in netstat -an parameter has the following meaning.
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LISTEN: Listen for connection requests from remote TCP ports.
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SYN_SENT: Wait for a matching connection request after sending the connection request.
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SYN_RECEIVED: After receiving and sending a connection request, wait for the other party to confirm the connection request.
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ESTABLISHED: Represents an open connection, which is commonly used as a concurrent connection.
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FIN_WAIT1: Wait for confirmation of remote TCP connection interruption request or previous connection interruption request.
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FIN_WAIT2: Waits for connection interruption request from remote TCP.
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CLOSE_WAIT: Wait for the connection interruption request from the local user.
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CLOSING: Wait for the remote TCP to acknowledge the connection interruption.
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LAST_ACK: Wait for confirmation of the connection interruption request originally sent to remote TCP.
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TIME_WAIT: Wait long enough to ensure that the remote TCP receives the acknowledgement of the connection interruption request.
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CLOSED: no connection status.