Configuration Manager manifest synchronization failing since 8 July 2026
Has anyone else experienced Configuration Manager Updates and Servicing synchronization failures since 8 July 2026? We have three independent Microsoft Configuration Manager hierarchies: Test environment Production T0 environment Production T1 environment All three started showing the same SMS_DMP_DOWNLOADER error during the last three days. The affected request is sent to: https://sccm.manage.microsoft.com/SCCMConnectedService.svc/Manifest Configuration Manager builds a hierarchy-specific request containing the Tenant, Version, Ring, and Branch parameters. However, the endpoint now returns only: OK The resulting file is: ConfigMgr.Update.Manifest.cab Size: 2 bytes Hex: 4F 4B Content: OK Because this is not a valid signed CAB file, dmpdownloader.log records: manifest.cab (http response) size is 2 Error in verifying the trust of file ConfigMgr.Update.Manifest.cab' WARNING: Failed to call IsFileTrusted WARNING: Failed to download and verify the manifest.cab. We cant get info in Updates and Servicing mode.
Existing required application deployments policy is not sent to devices
I have couple hundred applications in SCCM/MCM that are set to required and whenever there is a new device is built, all these required applications automatically get installed. I am on 2503 and 5 days ago i started seeing this issue. But if modify that deployment with current date and time then the application gets deployed right away if i run Application Deployment evaluation cycle. I also tested by deleting the existing deployment and created a new required deployment and run Application Deployment evaluation cycle then the application installs right away. The problem seems like the Primary server is not sending the policy to the client for existing deployments. The application compliance that we see for every deployment under Monitoring for all the devices moved to Error with Success. Not sure why this is happening. All these changes i noticed in the last one week. A week ago all these Already Compliant and Success status device count is under Success tab. Let me know if you have any suggestions.
Updates Not Installing by Install Deadline
Hello all! We have an organization with about 12,000 Windows 11 Workstations. I'm noticing that even though install deadline is set, and updates are allowed to be installed before install deadline hits, we are noticing in Software Center that updates say "will install after _____" (deadline date). How can I change this? I want updates to install during the maintenance window as well as a reboot. What am I missing? Connor
SCCM PXE Boot Deep Dive – Backend Flow & DP Migration
SCCM PXE Boot Deep Dive – Backend Flow & DP Migration I recently worked on a Distribution Point migration and noticed PXE requests were still routing to the old DP due to DHCP/IP helper configuration. I put together a deep dive explaining: PXE flow (DHCP and TFTP sequence) Role of Distribution Points What changes during DP migration Common failure points One key takeaway: PXE issues are almost always network and routing related, not SCCM itself. Curious how others are handling PXE in large environments. Are you standardizing on IP helpers or still using DHCP options? Full article: http://SCCM%20PXE%20Boot%20Deep%20Dive%20–%20Backend%20Flow%20&%20DP%20MigrationMECM OSD TS Application Installations fail randomly to download content.
We are experiencing a persistent and well-documented issue with MECM OSD Task Sequences where Applications randomly fail to install after the MECM client has been installed. This behavior seems to affect many environments and has been an ongoing problem for years, yet a definitive solution remains elusive. In our case, we have over 30 Applications included in the OSD Task Sequence. Despite implementing all commonly recommended mitigations—such as inserting an additional restart after the MECM client installation and including a two-minute delay before the Application install task group begins—we still encounter random failures. The issue is not limited to any specific Application; it can be any one of the 30+ Apps, and the failure to download appears to occur entirely at random. Occasionally, most of the Applications install successfully, and only one will fail, which subsequently causes the entire Task Sequence to fail with the same error. Importantly, all of these Applications install without any issues post-OSD, further confirming that the problem lies not with the Applications themselves but with the process during the Task Sequence. The randomness of which App fails also suggests an underlying process, feature, or timing issue—not an App configuration problem. We have thoroughly validated all related infrastructure settings: Boundaries and boundary groups have been triple-checked. No boundary is assigned to multiple groups. Site system assignments are correct. We are using PKI certificates and HTTPS, and the client authentication certificate is present on the device at the time of failure. The issue has been replicated across both Windows 10 and Windows 11, ruling out any specific cumulative updates or OS version anomalies. No additional language packs are being installed—only language fallback is applied via the "Apply Windows Settings" step. One suspicious observation is the lack of any reference to our local Distribution Point in the LocationServices or CAS logs during failure events. Initially, this pointed to a possible boundary misconfiguration, but after multiple checks, no issues have been identified. Unfortunately, we are unable to use the common workaround of converting Applications to Packages, due to internal policies and deployment requirements. Therefore, we need to resolve this while continuing to use Applications in the Task Sequence. Given the number of years this issue has persisted across customer environments, it's surprising there isn’t more formal guidance or documentation available to help isolate the root cause. If anyone has encountered a similar scenario or has any advanced troubleshooting tips, we would greatly appreciate your insight.SCCM - 23/24H2 to 25H2 Upgrade
Hello SCCM Community! Having an issue with upgrading devices from 23 and 24H2 to 25H2, I am downloading the newest version in SCCM under Windows Servicing and Feature Upgrades and deploying it to the targeted collection, but nothing shows in Software Center. Upon checking the UpdatesDeployment log, it shows Actionable Updates = 0 in one of the lines, but I'm wondering why WUA is determining updates do not apply to the machine. I believed this could be a GPO restriction but I've confirmed that there are no conflicting GPOs or Registry Edits. Any suggestions? Thanks!
SYSTEM CENTER IMPLEMENTATION & LICENSING Guide
Dear Microsoft Community, Our organization is planning to deploy a comprehensive IT management solution using the Microsoft System Center Suite. The goal is to streamline infrastructure operations, enhance backup and recovery, manage both virtual and physical resources, oversee endpoints, and maintain security and compliance. We need guidance regarding the number and type of licenses required, specifically Client Management Licenses (CML), Server Management Licenses (ML), and System Center Suite licenses.Can't find and delete an antivirus exclusion made in MECM.
In the Microsoft Endpoint Configuration Manager current brunch I've added some of the detected malware to exclusions list via right-click in the section "Monitoring-Security-Endpoint protection status - Malware detected" and "Allow this threat". They were excluded for all the computers in a collection. How and where to find this exclusions and delete them? They are appeared on the client computers but not in the MECM Antimalware policies.Unified update platform (UUP) FAQ's
After a month of UUP update release, sharing best practices based on our field and feedback through multiple channels. 1. Will UUP patch work for CB 2111 and below? Our pre-req is Configuration Manager Version 2203 and above as per our release documents. For Configuration Manager Version 2111 (Lesser than this are unsupported now) to patch UUP updates for windows 11 22H2 seamlessly, enable delta download setting using client settings in ConfigMgr. When this option is set, delta download is used for all Windows update installation files, not just express installation files. 2. Please be sure to select the appropriate update classifications in your ADRs. If you have ADRs configured to auto-approve Security Updates, be sure to specify the “Security Updates” classification in your ADR settings. If you would like to take advantage of all the great features of UUP and utilize UUP feature updates to upgrade endpoint clients to Windows 11 22H2, be sure to include the “Upgrades” classification in your ADRs. This will ensure that as endpoint clients go through the OS upgrade they will receive the latest security updates as part of the upgrade and will only need to reboot once. If you do not want to utilize UUP feature updates to upgrade endpoint clients right now, you will want to exclude the “Upgrades” classification from your ADRs. Note: The feature updates will be released every month but there will be sharing of content for the old files and the new content should be only a few hundred MBs between the month releases. See Question 9 for more details on deduplication. 3. ConfigMgr + Adaptiva integrated solutions Adaptiva has released a patch for its customers to support the UUP. The public documentation can be found here: https://adaptiva.com/blog/using-unified-update-platform-with-adaptiva-onesite. Note that Adaptiva has asked customers not to enable delta download from the client settings and this is our recommendation from ConfigMgr 2203+ onwards only (which is our recommended version as well but as mentioned before for UUP to work with ConfigMgr 2111 there is a requirement to enable delta download from client settings.) 4. ConfigMgr console on Windows Server 2012 R2 cannot download the UUP Quality update fails to verify cert signature PatchDownloader.log Verifying file trust C:\Users\admin\AppData\Local\Temp\2\CAB291B.tmp.wim Software Updates Patch Downloader Authentication of file C:\Users\admin\AppData\Local\Temp\2\CAB291B.tmp.wim failed, error 0x800b0004 Software Updates Patch Downloader Attempting to delete 0 byte tmp files from previous downloads Software Updates Patch Downloader ERROR: DownloadUpdateContent() failed with hr=0x80073633 Software Updates Patch Downloader Workaround: Patch the Windows Server 2012 R2 with 2023 4B (April CU) which then fixes this issue. 5. ConfigMgr Patchdownloader component may fail to verify (*.psf files) if the UUP patches were synched before ConfigMgr 2111 version. The issue will persist even if ConfigMgr version is upgraded to ConfigMgr 2111+ if the updates were synched before ConfigMgr was on a lesser version than version 2111. Sample error in PatchDownloader.log Verifying file trust C:\WINDOWS\TEMP\CAB6062.tmp.psf Software Updates Patch Downloader Authentication of file C:\WINDOWS\TEMP\CAB6062.tmp.psf failed, error 0x800b0004 Software Updates Patch Downloader Attempting to delete 0 byte tmp files from previous downloads Software Updates Patch Downloader ERROR: DownloadUpdateContent() failed with hr=0x80073633 Software Updates Patch Downloader The below SQL query will help you identify the issue. -- Sample check for 2023-04 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems (KB5025239). -- Replace the unique update id below if you are searching for a different UUP update IF EXISTS( select all SMS_CIContentFiles.CI_UniqueID,SMS_CIContentFiles.Content_ID,SMS_CIContentFiles.FileName,SMS_CIContentFiles.FileSize, SMS_CIContentFiles.IsSigned,SMS_CIContentFiles.SecuredTypeID,SMS_CIContentFiles.SourceURL from vSMS_CIContentFiles AS SMS_CIContentFiles WHERE SMS_CIContentFiles.CI_UniqueID='3157dbaf-04f5-49fc-baef-300bbd6d121a' AND FileName like '%.psf' and isSigned= 1 ) PRINT 'UUP Updates likely synched before upgrading to 2111. This will need correction, Please call Microsoft support to correct this.' ELSE PRINT 'You are not likely affected by the UUP PSF update signing issue' If you get the output of the above query as 'UUP Updates likely synched before upgrading to 2111. This will need correction, please call Microsoft support to correct this.' then likely you are affected and open a support case with Microsoft to correct the issue. 6. UUP updates installed as a part of OSD TS in "Install Software Updates" step (Fixed 2309 or later) There is a known issue that is currently investigated. The issue is the Delta Download component of CCMEXEC not starting on time and the updates timeout on the first scan, later scans are not impacted. Workaround: Add a restart step in between two install software updates steps. This will allow UUP updates to be successfully downloaded and installed in the second attempt. Resolution: Upgrade to CB 2309 and upgrade the client. This issue is addressed. 7. Does offline servicing work with UUP updates? No. Offline servicing images with UUP QU updates from the ConfigMgr console is not supported. 8. Are Delivery Optimization (DO) and Delta Download (DD) components different ? What is ConfigMgr dependency on DO? Delivery Optimization is a Windows technology to deliver content in a smart way reducing internet bandwidth owned by the Windows team and Delta Download is a component which is an http listener for requests owned by the ConfigMgr team. Delivery Optimization is a peer-to-peer distribution technology available in Windows 11 and Windows 10 that allows devices to share content, such as updates, that the devices have downloaded from Microsoft over the internet. DO is a part of the Windows OS. Delta Download is a http listener and is a component of ConfigMgr. ConfigMgr requires the DO client as it invokes the Delta download listener to download the content (as we configure the alternate content location URL in WUA policy to point to Delta Download Listener URL). The Invocation flow is WUA (Windows Update Agent) -> DO (Delivery Optimization) -> DD (Delta Download). Hence even if we don't enable DO, ConfigMgr would automatically enable DO by setting these two policies. This is visible in the UpdateDOGPO.log SetDOGPOSettings: Set Windows DO group policy to DOGroupId = DeliveryMode = group Customers should not create any GPO settings to disable these policies OR edit the registry to disable the DOSVC service or from services console. 9. Update Supersedence changing to 6 months default for new installs. How does update supersedence affect UUP scenarios? Refer the blog for the announcement details for this change. The default for expiring updates which are superseded will only change for the new installations and the existing ones will not be altered from whatever the current setting is. 10. Does ConfigMgr have deduplication of files at source and distribution points? Deduplication at the source in ConfigMgr : When PatchDownloader component downloads a file it checks if the file exists in the same share and creates a hard link for the already existing file instead of re-downloading it. Scenario 1 If the files/folders for previous UUP update source package are on the same volume but different share name, customers don't go into creating hard link path at all. Scenario 2(a) If the Package path has a common share \\machine\share but different folders inside it (which is the normal case) like \\machine\share\jan and \\machine\share\feb we go to the hard link and create the hard link for the file with the Patchdownloader.log entry Content already downloaded. Created link for ContentID Scenario 2(b) Same scenario as 2(a) but the PatchDownloader here finds the same file present in a different share first apart from being present on the same share. Here the PatchDownloader doesn't go deep and check if the file is also present on the same share and fails to create the hard link. But here it doesn't download from internet again but copies the file from the other share to this share. Log entries fail to create hard link with error 17 (which is it thinks these are different drives). Could not create hard link: \\MachineNetbios\UpdatesPackage\2302_Win11_21H2_UUP\b1e9d019-7dec-4eee-b7e4-9e8eae99d89b.1\19222DDC6156FBE5570C3A6DDF69759662F93AEE_FeatureOnDemand.wim -> \\ MachineNetbios\22-11-UUPWin11\bcb528ff-85c2-4372-8b91-20bd0c7fa1e4\19222DDC6156FBE5570C3A6DDF69759662F93AEE_FeatureOnDemand.wim. LastErr=17 Summary It is recommended to have a single share for all the UUP monthly packages \\machine\UUP and then creating folders inside it for each months. for eg.. \\machine\share\jan and \\machine\share\feb . In this case ConfigMgr will create hard links instead of downloading the actual files again. Note If you actually check the properties of the folder it will still show the size of the actual file and not hard link. Use DU.exe from sysinternals suite to find the actual size of a folder. E:\UpdatesPackage\2302_Win11_21H2_UUP>E:\DU\du.exe . DU v1.62 - Directory disk usage reporter Copyright (C) 2005-2018 Mark Russinovich Sysinternals - www.sysinternals.com Files: 14 Directories: 2 Size: 9,675,198,236 bytes Size on disk: 9,675,227,136 bytes Note To find all the hard link references to a file use the fsutil command. fsutil harlink list <full_file_path> 11. Why does ConfigMgr UUP On-Prem download a 3-5GB wim when I want to install a very small FOD/LP package? This is an issue with the size attribute on the file as we don't download the full file for FOD/LP but only the needed byte ranges. Since we download the needed byte ranges only, the size that gets displayed for the file is the cumulative size of the file till that range. Meaning if the small FOD package is around 3035627519 of the byte range in the file, we will display the size of the file as around 2.82 GB. While in actuality we only downloaded the file ranges between 3034578944-3035627519 for the 1 MB FOD package. To confirm the actual size of the file on disk you can check the properties of the file and verify the "Size on disk". 12. Deduplication at the distribution points in ConfigMgr : Distribution Points in ConfigMgr are already designed to have a SIS (Single instance storage) in the form of Content Library. So we store any file only once no matter how many packages it is present in. More on ConfigMgr Content Library design here . For more details ref the actual windows blog and Configuration blog. Thank you, The Configuration Manager team
