Comment 32 for bug 1264368

Perhaps the following observation may shed some light on the subject?

Jun 12 12:27:06 R2D2 console-kit-daemon[1211]: GLib-CRITICAL: Source ID 202598 was not found when attempting to remove it

At exactly the same time, my proftpd log reports a connection from a wireless webcam that uploads images to this host:

2015-06-12 12:27:06,533 R2D2 proftpd[12446] R2D2 (XENTA-WIFI-CAM[192.168.1.73]): FTP session opened.
2015-06-12 12:27:06,683 R2D2 proftpd[12446] R2D2 (XENTA-WIFI-CAM[192.168.1.73]): USER john: Login successful.
2015-06-12 12:27:06,854 R2D2 proftpd[12446] R2D2 (XENTA-WIFI-CAM[192.168.1.73]): ROOT PRIVS: unable to seteuid(): Operation not permitted
2015-06-12 12:27:06,855 R2D2 proftpd[12446] R2D2 (XENTA-WIFI-CAM[192.168.1.73]): ROOT PRIVS: unable to setegid(): Operation not permitted
2015-06-12 12:27:06,903 R2D2 proftpd[12446] R2D2 (XENTA-WIFI-CAM[192.168.1.73]): RELINQUISH PRIVS: unable to seteuid(PR_ROOT_UID): Operation not permitted
2015-06-12 12:27:06,903 R2D2 proftpd[12446] R2D2 (XENTA-WIFI-CAM[192.168.1.73]): FTP session closed.