There are known issue regarding AFP on FreeNAS. Sometimes AFP can’t start properly and it continuously restarts. You can see it in the log and web GUI console. How to deal with it? Simply log in using SSH to your FreeNAS machine and type the following command:

$ sudo pkill afp

If this is not effective try:

$ sudo pkill -9 afp

That commands kills all processes with string “afp” in process name. Now try turn on the service using FreeNAS GUI.