Defender update fails

You can follow the question or vote as helpful, but you cannot reply to this thread. I have the same question Report abuse. Details required :. Cancel Submit. Reza Ameri Volunteer Moderator. Are you able to run Windows Update? Description: Microsoft Defender Antivirus real-time protection scanning for malware and other potentially unwanted software was enabled. Description: Microsoft Defender Antivirus real-time protection scanning for malware and other potentially unwanted software was disabled.

Description: Microsoft Defender Antivirus real-time protection feature configuration has changed. Description: Microsoft Defender Antivirus configuration has changed. If this is an unexpected event, you should review the settings as this may be the result of malware.

Description: Microsoft Defender Antivirus engine has been terminated due to an unexpected error. For antimalware, antivirus and spyware, at an elevated command prompt, type net stop msmpsvc , and then type net start msmpsvc to restart the antimalware engine. If it fails in the same way, look up the error code by accessing the Microsoft Support Site and entering the error number in the Search box, and contact Microsoft Technical Support. User action: The Microsoft Defender Antivirus client engine stopped due to an unexpected error.

To troubleshoot this event: Run the scan again. Description: Microsoft Defender Antivirus scanning for malware and other potentially unwanted software has been enabled. Description: Microsoft Defender Antivirus scanning for malware and other potentially unwanted software is disabled. Description: Microsoft Defender Antivirus scanning for viruses has been enabled. Description: Microsoft Defender Antivirus scanning for viruses is disabled. Description: Microsoft Defender Antivirus has entered a grace period and will soon expire.

After expiration, this program will disable protection against viruses, spyware, and other potentially unwanted software. Description: Microsoft Defender Antivirus grace period has expired. Protection against viruses, spyware, and other potentially unwanted software is disabled.

If Microsoft Defender Antivirus experiences any issues it will usually give you an error code to help you troubleshoot the issue. Most often an error means there was a problem installing an update. This section provides the following information about Microsoft Defender Antivirus client errors.

Use the information in these tables to help troubleshoot Microsoft Defender Antivirus error codes. The following error codes are used during internal testing of Microsoft Defender Antivirus. If you see these errors, you can try to update definitions and force a rescan directly on the endpoint. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful?

Please rate your experience Yes No. Any additional feedback? Tip You can also visit the Microsoft Defender for Endpoint demo website at demo. Submit and view feedback for This product This page. View all page feedback. In this article. The antivirus client encountered an error, and the current scan has stopped.

The scan might fail due to a client-side issue. This event record includes the scan ID, type of scan Microsoft Defender Antivirus, antispyware, antimalware , scan parameters, the user that started the scan, the error code, and a description of the error.

Primarily used to protect scripts PowerShell, VBS , though it can be invoked by third parties as well. The antimalware platform performed an action to protect your system from malware or other potentially unwanted software. Microsoft Defender Antivirus has taken action to protect this machine from malware or other potentially unwanted software. The antimalware platform attempted to perform an action to protect your system from malware or other potentially unwanted software, but the action failed.

Microsoft Defender Antivirus has encountered an error when taking action on malware or other potentially unwanted software. Microsoft Defender Antivirus has restored an item from quarantine. Microsoft Defender Antivirus has encountered an error trying to restore an item from quarantine. Microsoft Defender Antivirus has deleted an item from quarantine. Microsoft Defender Antivirus has encountered an error trying to delete an item from quarantine.

The antimalware platform deleted history of malware and other potentially unwanted software. Microsoft Defender Antivirus has removed history of malware and other potentially unwanted software. If you're looking for a list of Microsoft Defender processes, download the mde-urls workbook , and then select the Microsoft Defender Processes worksheet. The mde-urls workbook also lists the services and their associated URLs that your network must be able to connect to, as described in Enable access to Microsoft Defender for Endpoint service URLs in the proxy server.

Important This update is: needed by RS1 devices running lower version of the platform to support SHA2; has a reboot flag for systems that have hanging issues; is re-released in April and will not be superseded by newer updates to keep future availability; is categorized as an update due to the reboot requirement; and is only be offered with Windows Update.

Note If you are manually deploying Microsoft Defender Antivirus Platform Update, or if you are using a script or a non-Microsoft management product to deploy Microsoft Defender Antivirus Platform Update, make sure that version 4. Submit and view feedback for This product This page. View all page feedback. In this article. Microsoft Defender update for Windows operating system installation images. Manage how protection updates are downloaded and applied.

Manage when protection updates should be downloaded and applied. Manage updates for endpoints that are out of date.

If an endpoint misses an update or scheduled scan, you can force an update or scan the next time a user signs in. Manage event-based forced updates. You can set protection updates to be downloaded at startup or after certain cloud-delivered protection events.

Manage updates for mobile devices and virtual machines VMs. Step 3: Type the following command into the Command Prompt and press the Enter key. Step 4: Then type exe -signatureupdate into the Command Prompt and press the Enter key. If yes, you can try the next solution.

Step 1: Right-click the Start menu and select Run. Step 2: Type services. Step 4: You should make sure that Service status is Running. I think the issue must be fixed by the solutions above.