TLS Encryption Protocol: Special instructions

As a security precaution, CDC EvaluationWeb® and CDC PartnerServicesWeb® will require all users to enable the TLS 1.1 and 1.2 encryption protocols on their browsers effective Monday, August 3, 2015.

If you attempt to access these systems on or after this date and your settings are not updated, you will see an error message similar to this one:

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This change primarily affects users of Internet Explorer versions 9 and 10. Other browsers such as Google Chrome (22 or higher), Mozilla Firefox (23 or higher), Safari (7 or higher), and Internet Explorer 11 have these encryption protocols enabled by default, but it is possible that they could have been manually disabled in the past. If you experience the error above, you may want to check your settings (regardless of which browser you are using) and ensure that TLS 1.1 and TLS 1.2 are enabled.

If you are unsure which browser and version number you are using, you can navigate to to find out.

If you are using one of those older browsers, you will need to verify these settings on your computer. Depending on the security policies at your organization, you may need to request assistance from your local information technology staff to change any settings.


1. Open Internet Options (located in the Tools section of the Menu Bar, or directly from the Control Panel in Windows).

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2. Click on the Advanced Tab.

3. Scroll the Settings window to the bottom.

4. Check the following boxes:
      Use TLS 1.1
      Use TLS 1.2

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5. Click Apply.


There is no harm in having other boxes checked in this menu (e.g., Use SSL 3.0 or Use TLS 1.0), but you must have Use TLS 1.1 and Use TLS 1.2 checked at a minimum.