The WinRM service is not listening for WS-Management requests

Help! I just started having problems running remote power shell and using mapped drives as a remote administrator.

I have two computers on the same local network, one a PC developer machine (GIGAPC), and one Mac Mini with boot camp and Windows Server Core 2012 installed (MACPC).

They've been working fine for a few weeks, when sometime today I began to receive denied requests to open a remote power shell.

When I KVM switch to use my monitor and mouse on MACPC and open servermanager.exe I see this in error the event log:

MACPC   10149   Warning Microsoft-Windows-Windows Remote Management System     9/21/2014 4:10:52 AM

The WinRM service is not listening for WS-Management requests. 

 User Action 
 If you did not intentionally stop the service, use the following command to see the WinRM configuration: 

 winrm enumerate winrm/config/listener

On MACPC I can stop and start the service, but each time the service starts it says it works at the command prompt, but in the event log another entry is added like the one above, but with a newer timestamp.

If I type

(MACPC) C:\> winrm quickconfig

I get

WinRM service started.
WinRM is already set up for remote management on this computer.

If I type

(MACPC) C:\> winrm enumerate winrm/config/listener

I get

Listener
    Address = *
    Transport = HTTP
    Port = 5985
    Hostname
    Enabled = true
    URLPrefix = wsman
    CertificateThumbprint
    ListeningOn = 127.0.0.1, 192.168.1.180, ::1,     2001:0:9d38:6ab8:3426:20b8:cda6
:4a7d, fe80::5efe:192.168.1.180%14, fe80::3426:20b8:cda6:4a7d%15,   fe80::8cb3:7e5
e:db62:14e1%13

On my developer computer when I type

(GIGAPC) C:\> winrm get winrm/config -r:macpc

I get

WSManFault
    Message = Access is denied.

Error number:  -2147024891 0x80070005
Access is denied.

I've tried a number of things I've found on google, but nothing seems to help. The WinRM service is not listening.

Note: These two computers are NOT on a domain. They are in my home and both members of WORKGROUP.