I have a share from a 10.4.2 server that is set to not be guest mount or world readable, but with full permissions to user and group. When anybody connects to it (from 10.4.2) other than the owner of the folder, they get an error box saying that ‘The folder “” could not be opened because you do not have sufficient access privileges.’ The Finder Get Info also reports that the user has no access.
However, if the user does cd /Volumes// in Terminal, they have the correct access.
The server does not have ACLs turned on, and the share is set to inherit permissions from parent. Turning on guest AFP access does not make a difference.