Fix Safe Links URLs Time Out in Outlook and Microsoft 365
Question details
Safe Links URLs (e.g., nam12.safelinks.protection.outlook.com) are timing out when clicked in Outlook and Microsoft 365.
- Product
- Microsoft Outlook
- Device & OS
- not provided
- Scenario
- Clicking on protected links within emails across various platforms including Outlook for Windows, Outlook.com, and mobile devices.
- Observed behavior
- The browser attempts to load the Safe Links URL but eventually times out, preventing the user from accessing the intended website.
Before altering any security policies, check the Microsoft 365 Service Health Dashboard in the Admin Center to see if there is an active server-side outage affecting Microsoft Defender for Office 365.
Temporarily Disable Safe Links Protection
Turning off the Safe Links feature temporarily allows you to bypass the Microsoft server checking process and directly access the original links in your emails.
Since widespread timeout errors across different browsers and devices usually point to a Microsoft server-side issue, disabling the feature locally can provide an immediate workaround. You should re-enable this feature once the server outage is resolved to maintain your email security.
Navigate to the Microsoft 365 Defender portal and log in with your administrator credentials.
In the left navigation pane, go to 'Email & collaboration', click on 'Policies & rules', and then select 'Threat policies'.
Under the 'Policies' section, click on 'Safe Links'. Select the policy that applies to your affected users and click 'Edit protection settings'.
Toggle off the setting that checks URLs in email messages, save your changes, and then test clicking a link in Outlook.
Monitor Microsoft Service Health and Wait
If you prefer not to lower your email security settings, you can track the server status and wait for Microsoft to resolve the routing issue on their end.
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Frequently Asked Questions
Why do my Outlook links start with nam12.safelinks.protection.outlook.com?
This URL format indicates that Microsoft Defender for Office 365 is scanning your links for malicious content. Microsoft wraps the original URL in a secure proxy so it can check the destination in real-time before redirecting you safely.
Is it safe to disable the Safe Links feature in Microsoft 365?
Disabling Safe Links is generally not recommended as a permanent solution because it removes an important layer of security against phishing and malware. It should only be used as a temporary workaround during a known Microsoft server outage.
Can this timeout issue be caused by my web browser cache?
While clearing your browser cache can resolve local issues, if the Safe Links timeout occurs across multiple devices (Windows, mobile) and different web browsers simultaneously, it is almost certainly a Microsoft server-side issue rather than a local browser problem.
How long should I wait before re-enabling Safe Links?
If you disabled the feature due to an outage, check the Microsoft 365 Service Health dashboard daily. Once Microsoft marks the incident as resolved, you should re-enable the feature immediately to restore your email protection.
