The error codes listed in the following table may be returned by an operation on any of Microsoft Defender for Endpoint APIs. In addition to the error code, every error response contains an error message, which can help resolve the problem. The message is a free text that can be changed. At the bottom of […]
You can find help here if you encounter issues while migrating from a third-party security solution to Microsoft Defender Antivirus. Review event logs Open the Event viewer app by selecting the Search icon in the taskbar, and searching for event viewer. Information about Microsoft Defender Antivirus can be found under Applications and Services Logs > Microsoft > Windows > Windows Defender. From there, select Open underneath Operational. Selecting […]
If you encounter a problem with Microsoft Defender Antivirus, you can search the tables in this topic to find a matching issue and potential solution. The tables list: Microsoft Defender Antivirus event IDs (these apply to Windows 10, Windows 11, and Windows Server 2016) Microsoft Defender Antivirus client error codes Internal Microsoft Defender Antivirus client error […]
If your system is having high CPU usage or performance issues related to the real-time protection service in Microsoft Defender for Endpoint, you can submit a ticket to Microsoft support. Follow the steps in Collect Microsoft Defender Antivirus diagnostic data. As an admin, you can also troubleshoot these issues on your own. First, you might want […]
Important On March 31, 2020, the Microsoft Defender Antivirus reporting feature of Update Compliance will be removed. You can continue to define and review security compliance policies using Microsoft Endpoint Manager, which allows finer control over security features and updates. You can use Microsoft Defender Antivirus with Update Compliance. You’ll see status for E3, B, F1, […]
You might need to troubleshoot the Microsoft Defender for Endpoint onboarding process if you encounter issues. This page provides detailed steps to troubleshoot onboarding issues that might occur when deploying with one of the deployment tools and common errors that might occur on the devices. Troubleshoot issues with onboarding tools If you have completed the […]
When onboarding a device, you might see sign in issues after the app is installed. During onboarding, you might encounter sign in issues after the app is installed on your device. This article provides solutions to help address the sign-on issues. Sign in failed – unexpected error Sign in failed: Unexpected error, try later Message: Unexpected […]
This article provides some general steps to mitigate missing events or alerts in the Microsoft 365 Defender portal. Once Microsoft Defender for Endpoint has been installed properly on a device, a device page will be generated in the portal. You can review all recorded events in the timeline tab in the device page, or in advanced hunting page. This section […]
This document provides instructions on how to narrow down performance issues related to Defender for Endpoint on Linux using the available diagnostic tools to be able to understand and mitigate the existing resource shortages and the processes that are making the system into such situations. Performance problems are mainly caused by bottlenecks in one or […]
Important Some information relates to prereleased product which may be substantially modified before it’s commercially released. Microsoft makes no warranties, express or implied, with respect to the information provided here. Want to experience Defender for Endpoint? Sign up for a free trial. This article provides guidance on how to troubleshoot issues you might encounter with Microsoft […]