How to use psexec with non-domain machine.

I use psexec daily and have for a long time. It has has never worked with computers which are not in the domain until now. I have only tried this with Windows XP.

Under Administrative Tools:
LOCAL SECURITY SETTINGS
LOCAL POLICIES
SECURITY OPTIONS
Network Access: Sharing and security model for local
accounts.

Change from "Guest Only" to "Classic"

Both of these commands now work!

psexec \\10.1.2.3 -u 10.1.2.3\administrator -p localpass cmd

net use j: \\10.1.2.3\c$ /user:10.1.2.3\administrator localpass

Update: 10/24/12
Psexec worked with a Windows 8 machine not in the domain. I only had to disable the firewall.