For some reason, Standard users no longer can mount remote folders via AFP. It has always worked until last night. The list of folders appear, but after selecting the folder to mount, I get this: Yet, when attempting the mount using an admin account but using the same credentials (of the Standard user), it works. The problem seems to be only on this El Capitan machine. I have tried it from another El Capitan machine (same credentials and everything) and it works. Any help would be greatly appreciated.