Maybe the correct question is - why do you not want the users to use SSH? If you are trying to restrict users to only being able to access a node that they have a job running on, there is a PAM module for that.
Ian
Thank you Ian now My user use ssh to execute their own program without using qsub. and it's not really fair for other user that use qsub. Then the simpliest way avoiding this is to forbiden the connection I'm not specialist of PAM and authentication have you got a link ?
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