How to reset sshd of SBC?

For NN4500 SCZ7.2.0m6p8?

     When we do a ssh on active SBC, it is successful, but in stand-by it didn't. (Please see the attached file "logsforssh.jpg"-first image)

It is possible that the maximum number of allowed ssh sessions has been reached at least in the perspective of SBC. So we connect to console, issue the 'show users' command and kill all the sessions except for console.

(Please see the attached file "logsforssh.jpg"-second image below)

And tried to do a ssh again. But it fails because of the error: "Write failed: Broken Pipe". So we're guessing that the ssh daemon of SBC needs some reset.