Security Policy Errors

How to Unblock a Safe Website in Microsoft Defender SmartScreen

Amos Gikunda Oct 8, 2026 869 views

Question details

The user needs to unblock a trusted website that has been incorrectly classified as malicious by Microsoft Defender or SmartScreen.

How to Unblock a Safe Website in Microsoft Defender SmartScreen

Product: Microsoft Defender SmartScreen
Device & OS: not provided
Scenario: A legitimate and safe website is being blocked for users due to a false positive detection.
Observed behavior: Microsoft Defender or SmartScreen restricts access to the website, displaying a warning that the site is malicious.

Before you start

Ensure you have Microsoft 365 administrator privileges and verify that the website URL is genuinely safe before making any changes in the Defender portal.

Solution 1Recommended

Allow the URL and Report a False Positive in Microsoft Defender

Use the Microsoft Defender portal to add the website to the allow list and report it as a false positive to Microsoft for re-evaluation.

Microsoft Defender and SmartScreen use various security signals to protect users. When a safe site is flagged, admins can explicitly allow the URL format to restore access.

Access Microsoft Defender Portal

Navigate to the Microsoft Defender portal (security.microsoft.com) and log in with your Microsoft 365 admin credentials.

Navigate to Submissions

On the left-hand navigation pane, find the 'Actions & submissions' section and click on 'Submissions'.

Submit the Blocked URL

Select the 'URLs' tab and click 'Submit to Microsoft for analysis'. Enter the blocked website URL in the required field.

Request URL Allowance

Choose the option indicating that the URL is safe, which submits it for a false-positive review and allows you to bypass the block temporarily.

Allow the URL and Report a False Positive in Microsoft Defender

URL Patterns: When adding URL patterns, confirm that the format is supported. Using wildcard syntax like 'example.com/*' ensures that subdirectories and required paths are also permitted.

Solution 2

Contact Microsoft 365 Support for Persistent Blocks

If the website remains blocked after submission, escalate the issue directly to Microsoft 365 Support.

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Frequently Asked Questions

Why does Microsoft Defender SmartScreen block a safe website?

Microsoft Defender uses automated security algorithms and heuristic analysis. Occasionally, shared IP reputations or sudden changes in website behavior may trigger a false positive, incorrectly classifying a safe site as malicious.

How long does it take for Microsoft to review a false positive URL?

After submitting a URL through the Microsoft Defender portal, false-positive reviews are typically processed within 24 hours. However, complex cases or high support volumes may cause unexpected delays.

Can I use wildcard patterns when allowing URLs in Defender?

Yes, Microsoft 365 administrators can submit URL patterns (such as example.com/*) to unblock an entire domain and its required paths, ensuring that specific subpages or news articles are not individually blocked.

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