Right, I had tried to point to the pid file in the configuration file before, but apparently that wasn't a config file that btsync was actually reading :x For any future readers with the same issue: My correct configuration file was: /etc/btsync.conf I was able to point to the pid file by editing line 10 to: "pid_file" : "/usr/bin/.sync/sync.pid", It's all working now, thanks for the help