SMS Client not working (Failed to open to WMI namespace) in ccmexec.log

WMI has probably been corrupted. Run this script on the machine to repair WMI.

net stop winmgmt /y
c:
cd %windir%system32wbem
if exist %windir%system32wbemrepository.old rmdir /s /q repository.old
rename %windir%system32wbemrepository repository.old
for /f %s in (‘dir /b *.dll’) do regsvr32 /s %s
net start winmgmt
wmiprvse /regserver
net start ccmexec