Microsoft 365 Service Status
Official Microsoft 365 service health page.
Live Domain Check
Is Microsoft Defender Down? Check defender.microsoft.com Status and Outages
Check if Microsoft Defender is down right now (defender.microsoft.com). Run a live multi-region check to see whether Microsoft Defender is offline for everyone or just you.
Get official Microsoft Defender outage status updates, support links, and targeted troubleshooting steps in one page.
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About Microsoft Defender Outages and Server Issues
When Microsoft Defender has instability, teams usually first notice latency spikes and intermittent edge failures rather than a complete blackout.
For Microsoft Defender, early outage signals often show up as TLS handshakes, regional edge routing, and identity federation before a full failure. If results are mixed, use the website outage triage guide, the HTTP status codes guide, and the DNS troubleshooting guide to isolate provider incidents from local network issues.
Official Microsoft Defender Status, Support, and Social Channels
Use these official Microsoft channels to confirm outages, maintenance notices, and recovery progress for Microsoft Defender.
Azure Status
Official Azure public status dashboard.
MSFT365Status
Official updates for Microsoft 365 incidents.
Official Microsoft Defender Social Profiles for Live Updates
Use official Microsoft Defender social profiles to confirm live outage scope, maintenance updates, and recovery progress for defender.microsoft.com.
Common Microsoft Defender Problem Patterns
Use these service-specific patterns to identify likely root cause quickly and choose the right next step.
How to Check if Microsoft Defender Is Down
Practical steps to follow when defender.microsoft.com seems down. Use this checklist to confirm whether Microsoft Defender is down for everyone or only for you.
1. Check in two places
Run defender.microsoft.com in WebsiteDown.org first, then open defender.microsoft.com in your own browser. If both checks fail at the same time, Microsoft Defender is likely down beyond your local device.
2. Verify service status
Check the official Microsoft Defender service status page and compare timestamps with your failed checks.
3. Isolate network path
Test related hosts such as www.microsoft.com, portal.office.com. If they work while defender.microsoft.com fails, this points to a partial endpoint issue.
4. Escalate with evidence
Capture final URL, status code, and response time for defender.microsoft.com, then share those details with Microsoft Defender support for faster triage and recovery.
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, the issue is usually local cache, cookie, or extension state.
2. Reset account session once
Sign out and sign back in one time, then retry the failing action on defender.microsoft.com. Avoid repeated password or security resets until you confirm this is not a broader Microsoft Defender issue.
3. Remove network interference
Temporarily disable VPN, proxy, private DNS, and filtering extensions. Then switch between Wi-Fi and mobile data to isolate route-level differences.
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
Is Microsoft Defender down for everyone or just me?
Run the automatic multi-region check on this page for defender.microsoft.com. If most regions fail at the same time, Microsoft Defender is likely experiencing a broader outage or partial incident.
If only one or two regions fail, the issue is usually local to your network path (DNS resolver, ISP route, VPN/proxy, or firewall). Re-check after 2 to 5 minutes and compare Wi-Fi with mobile data.
Where can I find real-time Microsoft Defender outage updates?
Use the Status, Support, and Live Update Links section above. Start with vendor status and support sources, then compare with live social updates.
Official status dashboards are authoritative but can lag during the first minutes of an incident, so combining both sources gives faster signal.
Why is Microsoft Defender down for me but up for others?
That pattern usually points to route-specific or account-specific issues rather than a global outage. Common causes include:
- Stale DNS cache or resolver mismatch
- ISP route differences or regional peering congestion
- VPN/proxy filtering, WAF policy, or geo restrictions
- Session, cookie, or temporary rate-limit edge cases
Test from a second network and capture the exact error code before resetting credentials.
What should I do first if Microsoft Defender is not working?
Use this sequence for defender.microsoft.com:
- Run the live check
- Review official status/support updates
- Test from another network
- Record status code and final URL for escalation
- Only then clear DNS/cache if the issue appears local