monitor_window_timeout: Token acquisition in iframe failed due to timeout

Hello Hiten S, 

Thank you for reaching out to the Microsoft Q&A forum. 

When investigated we see that notification simply means the portal tried to silently fetch a telemetry/auth token inside an iframe and it didn’t come back before the default timeout (10 seconds). It falls back to other methods or retries automatically, so if you’re not seeing any real sign-in prompts or missing functionality, you don’t need to take any action right now.

If you ever do see a degraded experience or want to eliminate these messages, here are a few things you can try:

1. Check browser/network • Make sure you don’t have an ad-blocker or strict network policy blocking monitor.azure.com traffic. • Clear your browser cache and cookies, then reload the portal.
2. Monitor Azure service health • Go to https://azure.microsoft.com/status/ to see if there are any ongoing outages in your region.
3. (Only if you’re developing against MSAL.js) Increase the iframe timeout • The default is 10 000 ms (DEFAULT_IFRAME_TIMEOUT_MS). You can override this in your @azure/msal-browser config to give the iframe more time:

const msalConfig = {
  system: {
    iframeHashTimeout: 20000, // for example, 20 seconds
  },
  // …other settings
};

1. If the problem ever recurs in a way that impacts your user experience, check the Azure activity log to pinpoint the exact time the timeout happened and capture any portal error pages. Then you can open a support case for deeper authentication-module troubleshooting.

Hope that helps keep your site humming along!

Reference list:

• @azure/msal-browser package – DEFAULT_IFRAME_TIMEOUT_MS https://dotnet.territoriali.olinfo.it/javascript/api/@azure/msal-browser/?view=msal-js-latest
• monitor_window_timeout diagnostic note (internal ref: 2504150030005715)
• Troubleshoot VM monitoring in Azure Monitor (notes on ad blockers) https://dotnet.territoriali.olinfo.it/azure/azure-monitor/vm/vm-enable-troubleshoot?wt.mc_id=azure-cxp-community
• Azure service health https://azure.microsoft.com/status/

I think the core is that this alert is only the portal’s own silent‑token hop slipping, not your app… just open the portal once in a clean InPrivate tab and it clears—your site doesn’t touch that path at all.

The notification indicates that the browser, while using the Azure portal, intermittently failed to acquire an authentication token in a hidden iframe (monitor_window_timeout). This is a client-side/MSAL.js browser issue and not a problem with the website https://flyingkites.in itself.

The timeout typically occurs when:

• The hidden iframe used for silent authentication cannot complete in time (for example, due to browser extensions, network issues, or the page used as redirectUri manipulating the URL hash or navigating away), or
• The identity provider throttles or does not complete the redirect back to the redirectUri.

For portal usage, the recommended actions are:

1. Open an InPrivate/Incognito browser window and try the Azure portal again.
2. Temporarily disable browser extensions and test again.
3. Try another browser or machine to see if the issue reproduces.
4. If the error persists, collect a browser network trace while reproducing the issue and open a support case from the Azure portal.

These steps help confirm whether the issue is caused by the local browser environment or by network/API problems. They do not require any change to the running site itself. As long as the site continues to operate normally and there are no application errors, no direct action is required on the site for this specific notification.

References:

• Investigate failures, performance, and transactions with Application Insights
• Single-page application: Acquire a token to call an API
• Errors