There is a Windows 7 desktop PC with a shared folder on the root of the C drive (C:\sharename). This folder has Everyone with read/write access.
A Windows 7 laptop normally has a drive mapped to this folder as \hostname\sharename
Today, this mapping failed. A troubleshooter showed the connection was being rejected by the desktop PC.
I unmapped it, and remapped the drive, authenticating as a different user, and specifying a hostname\localusername as the user account (a local user account on the desktop PC).
This also failed.
Can you think why the original drive mapping would fail if Everyone has read/write access?
Can you think why the new drive mapping would fail if the localusername on hostname has read/write access?
I don't think the solutions listed in this thread apply, as the folder is not an administrative share, I believe.