I have setup ssh for remote user connection , now user ssh from server A to server B is no need to input password , it works fine .

But server B have a change password policy ( the user is required to change password every month , that means the password will be expired every month ) , so when user ssh to server B , they are required to change password when it was expired , can advise how to let the user is no need to change password when login with remote ssh , but still need to change password when normal login , eg. telnet , ftp etc ?

Thx

Try googling 'authorised keys'. BTW, each service has its own login settings, so this won't affect telnet etc.