closed port

The normal-closed electromagnetic valve has reasonable structure design and good close property ofthe valve port to prevent leakage completely.

它结构设计合理，阀口关闭性良好，确保无任何泄漏。

The New York Port Authority said it had closed all bridges and tunnels into the city.

纽约交通部门权威人士称所有入城桥梁和隧道均已关闭.

Note: Open Port pressure must exceed closed port pressure.

注意: 开户端口的压力必须超过关闭端口的压力.

If you provided a wrong sequence of knocks ( or no knocks at all), you would receive a "Connection timed out" message, and the SSH port would remain completely closed with no sign of its existence.

如果提供了错误的敲门序列（或根本没有敲门），会收到Connection timed out消息，SSH端口仍然完全关闭，看不出它是存在的。