Service Diagnostic

Is Microsoft Defender Down? Check defender.microsoft.com Status

Run a live multi-region check for defender.microsoft.com and compare the result with official Microsoft Defender sources, known failure modes, and local troubleshooting steps.

This page is built for outage triage: first confirm reachability, then verify official signals, then decide whether the problem is global, regional, or local to your account/network.

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Checking defender.microsoft.com reachability from multiple regions.

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Regional checks8 regions

How to interpret this Microsoft Defender result

Live reachability

The regional cards above show whether defender.microsoft.com is reachable now and whether failures cluster globally or by route.

Latest history

The recent-check panel below adds public check history for this exact page when data is available.

Limitations

This check measures public reachability for defender.microsoft.com. It cannot see every private region, enterprise route, customer account, or control-plane dependency inside Microsoft Defender.

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Is Microsoft Defender Down? Latest defender.microsoft.com Status Checks

Recent verdict history from users checking this specific page.

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What to check first for Microsoft Defender

For Microsoft Defender, start by separating defender.microsoft.com public reachability, account vault/session access, and policy enforcement. A reachable defender.microsoft.com does not prove every Microsoft Defender workflow is healthy.

Confirm defender.microsoft.com reachability and compare it with Official website.
Test account vault/session access and policy enforcement before changing account, device, or DNS settings.
If you see microsoft defender: regions disagree on reachability, keep the timestamp, final URL, and failing action for support or incident review.

Official Microsoft Defender sources

Use these provider-controlled or provider-owned sources after the live check, especially when the verdict is mixed or the issue only affects one workflow.

Official website

Confirms whether the primary defender.microsoft.com web surface is reachable outside the WebsiteDown.org probe.

Microsoft 365 Service Status

Official Microsoft 365 service health page.

Azure Status

Official Azure public status dashboard.

MSFT365Status

Official updates for Microsoft 365 incidents.

Official Microsoft Defender Social Profiles for Live Updates

These are provider-controlled channels from the source list above. They are useful during incidents, but they can still lag behind live reachability symptoms.

Common Microsoft Defender outage signs

These patterns help distinguish full defender.microsoft.com downtime from partial service degradation, account problems, or route-specific failures.

Microsoft Defender: Regions disagree on reachability

Microsoft Defender may resolve in one region and fail in another, which points to DNS, BGP, or edge routing differences.

Microsoft Defender: TLS or connection setup fails

TLS or connection setup fails before an HTTP response, so browser symptoms may look like downtime even without a 5xx status.

Microsoft Defender: Website and control plane disagree

The public website loads while control-plane actions fail, a common infrastructure-provider partial incident.

Microsoft Defender: Automated probes may be filtered

Automated probes may be challenged or filtered, so compare local browser access with regional signals before escalating.

When Microsoft Defender only fails for you

Use these steps when WebsiteDown.org or official sources suggest Microsoft Defender is generally reachable, but your own session still fails.

Run the live check, then compare DNS, TLS, and browser behavior from another network.
Check official Microsoft Defender sources before changing firewall, DNS, or routing settings.
Record affected region, resolver, status code, and timestamp for escalation.

How to check if Microsoft Defender is down

Use this workflow to compare the WebsiteDown.org result with official sources, your own browser, and a second network before changing account or device settings.

WebsiteDown.org workflow for checking whether Microsoft Defender is down on defender.microsoft.com. — A practical incident workflow for checking defender.microsoft.com before assuming a global Microsoft Defender outage.

How we check Microsoft Defender

WebsiteDown.org checks public reachability for defender.microsoft.com and separates that signal from product-specific symptoms inside Microsoft Defender.

The Microsoft Defender profile on this page is scoped to defender.microsoft.com, categorized as Cloud & Infra / Security, and grouped under microsoft. It cross-checks related hosts (www.microsoft.com, portal.office.com, status.office.com), uses verification sources such as Official website, Microsoft 365 Service Status, Azure Status, MSFT365Status, and compares nearby diagnostics including Microsoft, Azure, Xbox Live, Microsoft Copilot so parent, child, and sibling service outages do not get blended together.

defender.microsoft.com Public Reachability: Confirms whether defender.microsoft.com responds from regional probes before you investigate Microsoft Defender app-specific symptoms.
Account Vault/session Access: Sign-in and session paths can fail while public Microsoft Defender pages still load, so this is checked as a separate outage clue.
Policy Enforcement: Tracks the policy enforcement workflow as a separate Microsoft Defender signal, useful when the homepage and user reports disagree.
Device Trust Checks: Tracks the device trust checks workflow as a separate Microsoft Defender signal, useful when the homepage and user reports disagree.
DNS Resolution: Tracks the DNS resolution workflow as a separate Microsoft Defender signal, useful when the homepage and user reports disagree.

Why trust this Microsoft Defender check?

WebsiteDown.org keeps the live verdict, official sources, and service profile separate so you can see what is measured and what still needs confirmation.

The live result is a reachability signal for defender.microsoft.com from multiple regions, not a claim that every private Microsoft Defender workflow is healthy.
The service profile is built from curated diagnostic fields: checked surfaces, failure modes, related hosts, official sources, and limitations.
Official Microsoft Defender links are shown separately so you can verify provider-controlled status and support information before escalating.

Read the full WebsiteDown.org methodology.

Microsoft Defender data notes

These dates describe the editorial registry behind this page. Live check timestamps are shown in the result panel above.

Last reviewed: 2026-05-13
Service profile updated: 2026-05-13
Official sources reviewed: 2026-05-13
Registry scope: Microsoft Defender profile for defender.microsoft.com with 5 checked surfaces, 4 official sources, and 4 common failure signs.

Microsoft Defender troubleshooting guides

Use these guides when the live verdict, official sources, and your own symptoms disagree.