README for stunnel 4.x REQUIREMENTS PRE/POST-INSTALL Create a user/group stunnel with a unused id < 99: 'groupadd -g 48 stunnel' 'useradd -u 48 -g stunnel -d /var/run/stunnel -s /bin/false stunnel' 'passwd -l stunnel' PRECAUTION As of version 4.37 stunnel is configured to use a user and group stunnel instead of nobody/nobody. Adjust your /etc/stunnel.conf.