TMG HTTPS inspection is failing if the target Web site is using a CNG certificate

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If you have configured HTTPS Inspection on TMG you may not be able to access some sites such as Twitter and Dropbox.
In this scenario  clients will get a blank page and in the TMG logs you will see the error 0x8009000a.

Find out why and how to fix it here:

http://blogs.technet.com/b/isablog/archive/2014/05/28/tmg-https-inspection-is-failing-if-the-target-web-site-is-using-a-cng-certificate.aspx

About The Author

Debra Littlejohn Shinder is a technology and security analyst and author specializing in identity, security and cybercrime, utilizing her past experience as a police officer and police academy/criminal justice instructor. She has written numerous books and articles for web and print publications and has been awarded the Microsoft MVP designation for fourteen years in a row.

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