- You deploy Software Updates to a specific collection that has a maintenance window configured.
- The machine doesn’t reboot as required
- Check the Maintenance Windows properties
The maintenance Windows is set to a 2h duration :
- Check the Deployment properties
The first step is to make sure that your deployment allows reboot:
My machine is a Windows 2012 (thus considered a server) and the option to suppress reboot is not selected.
- Check if there’s overlapping maintenance Windows
Using the built-in report “Maintenance windows available to a specified client”, I can see that my maintenance Windows is applied correctly to my server and there’s no other maintenance windows applied.
- Check RebootCoordinator.log
The log to watch for this type of “error” is RebootCoordinator. Let’s see what it has to say :
The interesting part is there :
ServiceWindowsManager has allowed us to Reboot – Maintenance window has permitted to reboot
Scheduled reboot from agent UpdatesDeploymentAgent – Updates were deployed at 11:03 AM and a reboot is required
Then just after it shows the following entries:
ServiceWindowsManager has not allowed us to Reboot
ServiceWindowsManager says that we will not be able to Reboot in the future
We may not Reboot ever. Sending ‘System May Never Reboot’ Status Message
We may not reboot… EVER… we’re doomed ! 🙂
So… we’re in a Maintenance Windows but our log says otherwise. (Even if my window is still valid until 12:30PM)
Check your restart settings in your client settings : (Administration – Client Settings – [Your settings Name] – Client Restart
As you can see, the Temporary notification is set to 90 minutes.
11:03AM + 90 minutes = 12:33PM
12:33PM is 3 minutes outside the maintenance window !
The important thing to remember is to take into account the notification time in your maintenance Windows. Reducing the notification time or increasing the maintenance window period fixed the issue.
By the way you can list the collections that have a schedule in maintenance windows with the report Configuration Manager – Collections. Simply sort by the columns Maintenance Windows.
Founder of System Center Dudes. Based in Montreal, Canada, Senior Microsoft SCCM Consultant, 5 times Enterprise Mobility MVP. Working in the industry since 1999. His specialization is designing, deploying and configuring SCCM, mass deployment of Windows operating systems, Office 365 and Intunes deployments.