How to cancel restart initiated by mistake from Client Notification in SCCM console?

If you inadvertently clicked on Restart menu from Client Notification, that can be scaring if the target computers are critical servers in your company.

Don’t panick. Here is a way to cancel it.

Solution

Run the script as Admin on all the affected computers in whatever way you feel comfortable with.

#CANCEL a pending reboot
Remove-Item -Path 'HKLM:\SOFTWARE\Microsoft\SMS\Mobile Client\Reboot Management\RebootData'
Remove-Item -Path 'HKLM:\SOFTWARE\Microsoft\SMS\Mobile Client\Updates Deployment\RebootFlag
Remove-ItemProperty -Name * -path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired'
Shutdown -a
Restart-Service ccmexec -force

How to Check for a Pending Reboot on a host with SCCM client installed

If you have Configuration Manager managed client host, there will be ROOT\ccm\Client namespace in WMI. Class SDKCCM_ClientUtilities has a properties with two possible values:

• RebootPending
• IsHardRebootPending

NAMESPACE	CLASS	PROPERTY	VALUE	PRODUCT	NOTES
ROOT\ccm\Client	SDKCCM_ClientUtilities	DetermineifRebootPending	RebootPending	SCCM	ReturnValue needs to be 0 and this value is not null
ROOT\ccm\Client	SDKCCM_ClientUtilities	DetermineifRebootPending	IsHardRebootPending	SCCM	ReturnValue needs to be 0 and this value is not null

You can use the following PowerShell command to verity the client host needs a reboot or not.

Invoke-WmiMethod -ComputerName localhost -Namespace "ROOT\ccm\ClientSDK" -Class "CCM_ClientUtilities" -Name DetermineIfRebootPending | Select-Object -Property PSComputerName,RebootPending

PSComputerName RebootPending
—————————— ————————-
D00155DD61A6F False

You can also replace localhost with a real computer name to verify a remote host.

References

• https://adamtheautomator.com/pending-reboot-registry-windows/