How to Disable Certificate Error Checking in IE7

Written by james rutter
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How to Disable Certificate Error Checking in IE7
You can tell Internet Explorer 7 to stop checking for a website's certificate (Internet image by arabesque from

Websites use Public Key Certificates, such as a Self-Signed Certificate (SSL), as a way of proving a site's trustworthiness to a web browser visiting the page. Version seven of Microsoft's Internet Explorer (IE7) checks the certificates of every page to which a user navigates. If a website lacks a certificate, or if the information on the certificate does not match the website, IE7 will flash a pop-up warning that reads "Certificate error: navigation blocked."

Skill level:


  1. 1

    Launch IE7 by double-clicking the IE7 icon on your desktop.

  2. 2

    Open the Internet Options application window. Click the "Tools" icon in the top menu bar (it contains the word "Tools" next to an image of a gear). Highlight and click on "Internet Options."

  3. 3

    Open the "Advanced" detail panel in the Internet Options application window by clicking the "Advanced" tab in the top menu bar of Internet Options.

  4. 4

    Scroll down until you locate the "Security" settings.

  5. 5

    Turn off certificate checking. Use your cursor to uncheck the box next to "Warn about certificate address mismatch."

  6. 6

    Click "Apply" to save your settings. Click "OK" to exit. Restart IE7 for your changes to take effect.

Tips and warnings

  • Microsoft has recognised that computers running IE7 in the Windows Vista operating system can experience errors with IE7's certificate checker. Microsoft has provided a fix for this particular error on its website.
  • Sites that display certificates with incorrect or mismatching information might be trying to hijack your computer, or engage in phishing scams, where the site rifles through the contents of your hard drive to locate passwords and personal information. Microsoft strongly recommends that you do not turn off the Certificate reading function in Internet Explorer.

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