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title: Unexpected block or warning on customer website in Microsoft Edge
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title: Unexpected Block or Warning on Customer Website in Microsoft Edge
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description: Troubleshoot unexpected Microsoft Defender SmartScreen blocks or warnings on websites and learn how to report false positives.
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ms.custom: 'sap:Web Platform and Development\Connectivity and Navigation: TCP, HTTP, TLS, DNS, Proxies, Downloads'
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ms.reviewer: dili, Johnny.Xu, v-shaywood
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# Unexpected SmartScreen block or warning on website
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When you visit a website in Microsoft Edge, [Microsoft Defender SmartScreen](/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen) might unexpectedly block the site or display a warning if it determines the site is potentially unsafe. This article describes the criteria that SmartScreen uses to determine if a site is potentially unsafe and how to resolve a site being incorrectly marked as unsafe.
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When you visit a website in Microsoft Edge, [Microsoft Defender SmartScreen](/windows/security/operating-system-security/virus-and-threat-protection/microsoft-defender-smartscreen) might unexpectedly block the site or display a warning if it determines that the site is potentially unsafe. This article discusses the criteria that SmartScreen uses to determine whether a site is potentially unsafe, and how to resolve the issue if a site is incorrectly marked as unsafe.
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## Symptoms
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When you visit a website, Microsoft Edge displays a warning page indicating that the site is reported as unsafe.
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When you visit a website, Microsoft Edge displays a warning page that indicates that the site is reported as unsafe.
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:::image type="content" source="./media/unexpected-block-warning/site-blocked.png" alt-text="Screenshot of a SmartScreen block page":::
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:::image type="content" source="./media/unexpected-block-warning/site-blocked.png" alt-text="View of the SmartScreen block page.":::
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## Cause
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Microsoft Defender SmartScreen determines whether a site is potentially unsafe based on several factors:
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Microsoft Defender SmartScreen determines whether a site is potentially unsafe based on several factors, as listed in the following table.
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|**User Feedback**| Number of reports and trust level |
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|**Dynamic Behavior**| JavaScript activity, redirects, and obfuscation |
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If a site fails the checks of these dimensions, SmartScreen reports the site as unsafe.
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If a site fails these dimension checks, SmartScreen reports the site as unsafe.
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## Solution
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### You're the website owner
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### If you're the website owner
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1. Select **Report that this site doesn't contain (malware/phishing) threats** under the **More information** header on the block page.
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:::image type="content" source="./media/unexpected-block-warning/report-site-safe-blocked.png" alt-text="Screenshot of a SmartScreen block page with the link to 'Report that this site doesn't contain malware threats' highlighted.":::
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:::image type="content" source="./media/unexpected-block-warning/report-site-safe-blocked.png" alt-text="A SmartScreen block page that has the link to 'Report that this site doesn't contain malware threats' highlighted.":::
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1. Wait for a confirmation email from the SmartScreen Reputation Group:
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1. Wait for a confirmation email message from the SmartScreen Reputation Group.
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:::image type="content" source="./media/unexpected-block-warning/smartscreen-team-reply.png" alt-text="Screenshot of the SmartScreen Reputation Group reply email.":::
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:::image type="content" source="./media/unexpected-block-warning/smartscreen-team-reply.png" alt-text="The SmartScreen Reputation Group reply email message.":::
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1. If the issue is urgent or you need a response after the Reputation Group's investigation, reply to the email from the Reputation Group with your concerns.
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1. If the issue is urgent, or you need a response after the Reputation Group's investigation, reply to the message from the Reputation Group to present your concerns.
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### You're not the website owner
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### If you're not the website owner
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1. Reach out to the website owner and recommend that they report the issue by using the steps in [You are the website owner](#youre-not-the-website-owner).
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1. Reach out to the website owner, and recommend that they report the issue by using the steps in [You are the website owner](#youre-not-the-website-owner).
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1. Both the site owner and you can report the issue by using the [WDSI file submission portal](https://www.microsoft.com/en-us/wdsi/filesubmission). When prompted for user type, select **Enterprise customer**.
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1. Both the site owner and you can report the issue by using the [WDSI file submission portal](https://www.microsoft.com/en-us/wdsi/filesubmission). When you're prompted for user type, select **Enterprise customer**.
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### Prevent your site from being blocked
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To reduce the likelihood of SmartScreen blocking your site:
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1. Enable _HTTPS_ and use a valid certificate.
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1. Block iframe loading of unknown third-party content.
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1. Enable _HTTPS_, and use a valid certificate.
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1. Block iframe from loading unknown third-party content.
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1. Use _Content Security Policy (CSP)_ and other secure response headers.
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1. Regularly scan for WebShells, trojans, and suspicious uploaded files.
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1. Maintain _domain reputation_ and avoid frequent changes to hosting or DNS.
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