Unable to register host with fog server due to an unknown error

[sysadmininstalls]

The windows desktops display “unable to register host with fog server due to an unknown error” every time they are booted. The fog.log shows nothing of any interest and I am unsure where to go from here.

Fog 1.2
Centos 5.11

Not sure if it is related, but installing any snapin works, then we get the following:
2/16/2015 3:57 PM FOG::SnapinClient FOG Snapin Installtion complete.
2/16/2015 3:57 PM FOG::SnapinClient Installation returned with code: 0
2/16/2015 3:57 PM FOG::SnapinClient Attempting to connect to fog server…
2/16/2015 3:57 PM FOG::SnapinClient Unknown error, module will exit.
2/16/2015 3:58 PM FOG::GUIWatcher Message found, attempting to notify GUI!
2/16/2015 3:58 PM FOG::GUIWatcher Dispatch OK!
Which means until the service is restarted no more snapins can be deployed.

[sysadmininstalls]

in the logs I see the machine tried to access

/fog/service/register.php?mac=00:18:8B:8C:2C:0D&hostname=6P1QBC1&ip=10.10.222.166&os=1
If I view that in a browser from the same machine I get
#!er:Invalid Version Number, please update this module.