Microsoft Defender service status
Check whether the provider lists a problem with the feature you use. Look at the update time and any affected regions.
Live Domain Check
Is Microsoft Defender Down? Check defender.microsoft.com Status and Outages
Run a live reachability check for defender.microsoft.com. Compare the regional responses with the problem you see in Microsoft Defender.
Find Microsoft Defender help and reporting links, specific checks, and step-by-step guidance below the live result.
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Checking reachability from multiple regions.
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Regional checks
Is Microsoft Defender working for you?
Share a quick update and see what other visitors are experiencing.
What’s happening? Choose one to send your report.
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Visitor reports are separate from our automated checks and don’t confirm an outage. How reports work · Privacy
Understanding Microsoft Defender connection and service problems
Defender portal access, endpoint protection state and alert ingestion are different checks.
The checker above requests defender.microsoft.com from eight configured locations and shows the responses and measurement times. Compare those observations with the actual Microsoft Defender action that failed. A homepage response alone cannot verify an account, app workflow or transaction.
For a cloud administration or security-console issue, compare the entrypoint involved in your actual workflow: Azure status check, Azure Portal status check. Compare results separately; these links do not establish a shared outage.
Looking for another service? Browse infrastructure checks.
Microsoft Defender status information and official help
Microsoft Defender help and reporting
Use the organisation's authorised security/identity administrator and product support.
Open defender.microsoft.com
Open the website in your browser and compare it with the result above.
Where to report problems with Microsoft Defender
Open Microsoft Defender help / reporting. Use the provider's customer-service or account-help route for the affected product. Sign-in may be required for private account questions.
Details to include in your report
Defender product, tenant/device reference privately, alert or portal action, client version and correlation ID.
Attach the checker’s downloaded JSON if it helps show the hostname, regional responses and original timestamps. Describe what happened in your browser or app as well. A report sent to WebsiteDown.org is not automatically forwarded to Microsoft Defender.
What to check when Microsoft Defender is not working
These are troubleshooting comparisons, not claims that Microsoft Defender is currently experiencing a particular incident.
Start with the action that failed
Identify the Defender product and compare portal availability with the affected device's reported protection state.
Narrow down the affected service
Use the organisation's security administrator and relevant Microsoft service-health information; do not disable protection to test website access.
Read the actual checker response
A 403 Forbidden or 429 Too Many Requests means the host answered but refused or limited that request. A timeout gives no HTTP response. Keep those outcomes separate and check the available-region count before treating the result as broad evidence.
How to check if Microsoft Defender is down
- Save the error. Note what you were doing and when it failed. Save unfinished work before refreshing.
- Run the defender.microsoft.com check. Look at the regional results and when they were checked. Checking again may return a cached result.
- Check for a service notice. Open Microsoft Defender status and check whether the named service and incident time fit your error.
- Try another browser or network. Use the specific checks above to narrow down the problem. If it continues, send the error and time through the official help link.
If Microsoft Defender Is Not Working Only For You, Start Here
Use these local troubleshooting steps after the down-check workflow when Microsoft Defender seems broken only for you. This section focuses on app, browser, account, and network fixes.
1. Compare browser sessions
Open defender.microsoft.com in your current browser, then test in a private window or second browser. If only one session fails, compare its account, cookie and extension context before assuming the entire service is unavailable.
2. Preserve a working account session
Keep an existing working session and preserve unsaved work. For a sign-in failure, use the official account-help route. Avoid repeated password or security resets until you confirm this is not a broader Microsoft Defender issue.
3. Try another network
If possible, compare Wi-Fi with mobile data and note which one fails. Leave any required work VPN or security settings in place.
4. Capture support-ready evidence
Save timestamp, device, network type, exact error, final URL, and status code. Use the check workflow above before contacting Microsoft Defender support.
Frequently asked questions about Microsoft Defender problems
Is Microsoft Defender down, or is the problem limited to one feature?
Run the defender.microsoft.com check and compare its original timestamps and responses with your actual error. Defender portal access, endpoint protection state and alert ingestion are different checks.
Where can I report a problem with Microsoft Defender?
Use the community buttons on this page to share whether the service works for you. For help from Microsoft Defender, use the official help/reporting resource linked above. Use the organisation's authorised security/identity administrator and product support.
What should I check first when Microsoft Defender is not working?
Identify the Defender product and compare portal availability with the affected device's reported protection state. Use the organisation's security administrator and relevant Microsoft service-health information; do not disable protection to test website access.
What information helps Microsoft Defender support investigate?
Defender product, tenant/device reference privately, alert or portal action, client version and correlation ID.