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Pages Not Displaying or 500 Internal Server Error

Kmcnet 1,356 Reputation points
2026-03-02T00:53:04.75+00:00

Hello everyone and thanks for the help in advance. I have a webpage running on Windows Server 2022 with IIS that has been running perfectly fine until yesterday. Now depending on the browser, the page either states it does not have a secure connection and stops moving forward (Chrome) with an error message of You cannot visit kidsmedicalcare.com right now because the website uses HSTS. Network errors and attacks are usually temporary, so this page will probably work later, or Page cannot be displayed (Firefox). However, when I view the page on the server itself, the page displays correctly in both Chrome and Firefox. Additionally, when I view this page from another Windows Server, I can successfully view the page. I'm not really sure where to start on this. Any help would be appreciated.

Windows for business | Windows Server | User experience | Session connectivity
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  1. Henry Mai 8,200 Reputation points Independent Advisor
    2026-03-02T03:46:49.2933333+00:00

    Hello Kmcnet, I am Henry, and I’ve been looking into this for you.

    I have tested your URL from multiple external networks using both Chrome and Safari, and the site is loading perfectly with a valid SSL certificate. This confirms your server is configured correctly.

    The error you are seeing is likely because your browser has cached an old "security promise" (HSTS) from before you finalized your setup. Because your site uses HSTS, the browser is blocking the connection to "protect" you from what it thinks is a change in security.

    To fix this on your specific machine, please try the following:

    For Chrome:

    1. Open Chrome and type chrome://net-internals/#hsts in the address bar.
    2. Scroll to the bottom to Delete domain security policies.
    3. Enter kidsmedicalcare.com and click Delete.
    4. Restart the browser and try again.clearing HSTS settings in chrome

    For Firefox:

    1. Close all tabs for kidsmedicalcare.com.
    2. Press Ctrl + Shift + H to open the History window.
    3. Search for kidsmedicalcare.com.
    4. Right-click the site and select "Forget About This Site". (Note: This clears the cache and security rules for this specific domain).
    5. Restart Firefox and try again.Deleting the cache History in Firefox

    If the issue persists, check if your Antivirus (Avast, Bitdefender, etc.) has an "HTTPS Scanning" or "Web Shield" feature enabled. Sometimes these programs act as a "man-in-the-middle" and can cause connection blocks if their internal certificate store is outdated.

    I hope you’ll give my recommendation a try and let me know how it goes and if this answer helps, feel free to hit “Accept Answer” so others can benefit too.

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