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Troubleshoot Outlook 2013 and 2010 SSL Certificate Error

Purpose


This document provides a solution for Outlook 2010 and Outlook 2013 clients that receive an SSL Cert error upon loading a new or existing profile. This error appears as a Security Alert for the used email domain which notes “The application experienced an internal error loading the SSL libraries. This site should not be trusted.” There is no actual problem with the certificate returned. This is an issue with Outlook’s AutoDiscover process.

Example error message:

Verbose


This alert is due to a change in Outlook client behavior with Windows 8.x and Outlook 2013 although reports have surfaced from clients running Outlook 2010. In either case a registry fix can be applied which removes the invalid connection attempt that generates this error. The connection attempt is made concurrently with other Exchange AutoDiscover protocol queries and exempting this request does not impact the security or usability of Outlook or the Exchange platform for email.


Solution for Outlook 2013

Create or import the following key:

[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\AutoDiscover]
"ExcludeHttpsRootDomain"=dword:00000001
Solution for Outlook 2010

Create or import the following key:

[HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\AutoDiscover]
"ExcludeHttpsRootDomain"=dword:00000001

Additional Information

Microsoft documents these Registry keys at the following article in the Microsoft Knowledge Base:
2212902 - Unexpected Autodiscover behavior when you have registry settings under the \Autodiscover key


Article ID: 22, Created On: 11/7/2014, Modified: 11/7/2014

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