Receiving error from log file on Agent Push for SCCM 2012 SP1.
Couldn’t verify ‘C:\Windows\ccmsetup\MicrosoftPolicyPlatformSetup.msi’ authenticode signature. Return code 0x800b0101
InstallFromManifest failed 0x80004005
CcmSetup failed with error code 0x80004005
Install KB 2756872 Patch Fixed for me on Windows Server 2012.
Update 14/1/2013 : Microsoft Article - Installation error 0x800b0101: System Center 2012 Configuration Manager Service Pack 1 client
