Windows Update Error Codes

WU_E_NO_SERVICE Windows Update Agent was unable to provide the service.

WU_E_MAX_CAPACITY_REACHED The maximum capacity of the service was exceeded.

WU_E_UNKNOWN_ID An ID cannot be found.

WU_E_NOT_INITIALIZED The object could not be initialized.

WU_E_RANGEOVERLAP The update handler requested a byte range overlapping a previously requested range.

WU_E_TOOMANYRANGES The requested number of byte ranges exceeds the maximum number (2^31 - 1).

WU_E_INVALIDINDEX The index to a collection was invalid.

WU_E_ITEMNOTFOUND The key for the item queried could not be found.

WU_E_OPERATIONINPROGRESS Another conflicting operation was in progress. Some operations such as installation cannot be performed twice simultaneously.

WU_E_COULDNOTCANCEL Cancellation of the operation was not allowed.

WU_E_CALL_CANCELLED Operation was cancelled.

WU_E_NOOP No operation was required.

WU_E_XML_MISSINGDATA Windows Update Agent could not find required information in the update's XML data.

WU_E_XML_INVALID Windows Update Agent found invalid information in the update's XML data.

WU_E_CYCLE_DETECTED Circular update relationships were detected in the metadata.

WU_E_TOO_DEEP_RELATION Update relationships too deep to evaluate were evaluated.

WU_E_INVALID_RELATIONSHIP An invalid update relationship was detected.

WU_E_REG_VALUE_INVALID An invalid registry value was read.

WU_E_DUPLICATE_ITEM Operation tried to add a duplicate item to a list.

WU_E_INSTALL_NOT_ALLOWED Operation tried to install while another installation was in progress or the system was pending a mandatory restart.

WU_E_NOT_APPLICABLE Operation was not performed because there are no applicable updates.

WU_E_NO_USERTOKEN Operation failed because a required user token is missing.

WU_E_EXCLUSIVE_INSTALL_CONFLICT An exclusive update cannot be installed with other updates at the same time.

WU_E_POLICY_NOT_SET A policy value was not set.

WU_E_SELFUPDATE_IN_PROGRESS The operation could not be performed because the Windows Update Agent is self-updating.

WU_E_INVALID_UPDATE An update contains invalid metadata.

WU_E_SERVICE_STOP Operation did not complete because the service or system was being shut down.

 WU_E_NO_CONNECTION Operation did not complete because the network connection was unavailable.

WU_E_NO_INTERACTIVE_USER Operation did not complete because there is no logged-on interactive user.

WU_E_TIME_OUT Operation did not complete because it timed out.

WU_E_ALL_UPDATES_FAILED Operation failed for all the updates.

WU_E_EULAS_DECLINED The license terms for all updates were declined.

WU_E_NO_UPDATE There are no updates.

WU_E_USER_ACCESS_DISABLED Group Policy settings prevented access to Windows Update.

WU_E_INVALID_UPDATE_TYPE The type of update is invalid.

WU_E_URL_TOO_LONG The URL exceeded the maximum length.

WU_E_UNINSTALL_NOT_ALLOWED The update could not be uninstalled because the request did not originate from a WSUS server.

WU_E_INVALID_PRODUCT_LICENSE Search may have missed some updates before there is an unlicensed application on the system.

WU_E_MISSING_HANDLER A component required to detect applicable updates was missing.

WU_E_LEGACYSERVER An operation did not complete because it requires a newer version of server.

WU_E_BIN_SOURCE_ABSENT A delta-compressed update could not be installed because it required the source.

WU_E_SOURCE_ABSENT A full-file update could not be installed because it required the source.

WU_E_WU_DISABLED Access to an unmanaged server is not allowed.

WU_E_CALL_CANCELLED_BY_POLICY Operation did not complete because the DisableWindowsUpdateAccess policy was set.

WU_E_INVALID_PROXY_SERVER The format of the proxy list was invalid.

WU_E_INVALID_FILE The file is in the wrong format.

WU_E_INVALID_CRITERIA The search criteria string was invalid.

WU_E_EULA_UNAVAILABLE License terms could not be downloaded.

WU_E_DOWNLOAD_FAILED Update failed to download.

WU_E_UPDATE_NOT_PROCESSED The update was not processed.

WU_E_INVALID_OPERATION The object's current state did not allow the operation.

WU_E_NOT_SUPPORTED The functionality for the operation is not supported.

WU_E_WINHTTP_INVALID_FILE The downloaded file has an unexpected content type.

WU_E_TOO_MANY_RESYNC Agent is asked by server to resync too many times.

WU_E_NO_SERVER_CORE_SUPPORT WUA API method does not run on Server Core installation.

WU_E_SYSPREP_IN_PROGRESS Service is not available while sysprep is running.

WU_E_UNKNOWN_SERVICE The update service is no longer registered with AU.

WU_E_UNEXPECTED An operation failed due to reasons not covered by another error code.

WU_E_MSI_WRONG_VERSION Search may have missed some updates because the Windows Installer is less than version 3.1.

WU_E_MSI_NOT_CONFIGURED Search may have missed some updates because the Windows Installer is not configured.

WU_E_MSP_DISABLED Search may have missed some updates because policy has disabled Windows Installer patching.

WU_E_MSI_WRONG_APP_CONTEXT An update could not be applied because the application is installed per-user.

WU_E_MSP_UNEXPECTED Search may have missed some updates because there was a failure of the Windows Installer.