My G5 tower running 10.5.8 (let's call it "Mac 1") is sporadically inaccessible and then only partly accessible via personal file sharing on my local network (all ethernet).
First, I enabled the checkmark in Accounts / Guest user: "Allow guests to connect to shared folders" (the checkmark above it, "Allow guests to log in to this computer", is unchecked). Firewall is set to its default: allow all incoming connections.
In the Sharing pane of system settings, I enabled three folders on Mac 1 with rights that include read/write for Everyone (I believe this equates to guest access). In the options button of the sharing pane, I have checked "Share files and folders using AFP".
On my newer Mac running Mavericks (Mac 2), I then go to the finder and hit Command-K to bring up the "Connect to Server" pane. I click Browse, and a window appears showing the name of Mac 1, but when I click on it it just says I'm connected as a guest--yet no folder names are shown, and I apparently can't copy to or from the empty file list below its title. When I attempt to drag something into this name-of-computer file list, it says "Modifying "Mac 1" requires an administrator name and password. To move [filename], click Authenticate [and there's an OK button]." Huh? Mac 1 clearly has guest access enabled. I also ran Disk First Aid and hit both repair disk (it said it didn't need it) and repair permissions (it indicated it did fix a few permissions, but it didn't fix this sharing problem).
As a test, I went to yet another G5 (running 10.4) on my network (let's call it Mac 3). It can easily connect to one of the three folders on Mac 1 as a guest, but it can't see the other two folders, which are set up with identical permissions. In addition, the guest-shared folder on Mac 3 is visible and accessible from both Mac 1 (10.5) and Mac 2 (Mavericks). Also, an Airport Express with a hard drive attached has a hard drive that is equally accessible to all three machines, so it appears my network is okay. Any ideas?