Add Users to a Group on CentOS 7

 How to Add a User to a Group on CentOS (linuxhint.com)

Now to add the user ash to the work group with the following command:

sudo usermod -aG work ash

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Check to be sure that port 22 is enabled before you reload

 https://superuser.com/questions/590600/ufw-is-active-but-not-enabled-why etting  ENABLED=yes  in  /etc/ufw/ufw.conf  did it for me. $ sudo ...