Linux / UNIX kill unresponsive hung SSH session

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Sometimes my ssh session stops working because of the internet connection problem. I tried pressing CTRL+Z and CTRL+C to terminate my ssh session but failed to work. How do I properly kill a hung SSH session without killing my local terminal or using the kill command? How can I kill unresponsive hung SSH session on macOS?

Howto stop or terminate Linux command process with CTRL + C

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Q. Sometime I type command and accidentally hit the [ENTER] key and immeditly realized that it was wrong command. How do I stop process assuming that process is not going in background? For example
cp /path/* /wrong/path

Stop or terminate Linux command process with CTRL + C

A. To stop process hit CTRL + C, for example, you entered:
$ cp -r /path/* /wrong/path

To stop the command hit CTRL+C and retype the command:
$ cp -r /path/* /correct/path