On my CentOS 6: chkconfig --list wpa_supplicant shows off at all levels, which is confirmed by examination of: /etc/init.d/wpa_supplicant but ps -ef shows the process running. Furthermore, repeated cd /etc/init.d/ ./wpa_supplicant stop appears to succeed, but the process continues to run. These observations were made at levels 3 and 5. Thanks in advance for your explanation. Mike.