Return Code -85

Dear all,

Something strange had happened to us. The firmware of our unit (FG-600D) is 6.2.5

I can successfully update all of my fortiguard signatures except Application Control via CLI and a TFTP Server.

I tried to update Application Control signatures several times but I got an error which has been attached to this post.

The error is Get other objects from TFTP server ok. Command Fail. Return Code -85.

Any help would be really appreciated.