A client that is trying to access an SSL enabled application on a backend server (e.g. Exchange) that is published through the Forefront UAG portal gets an error, specifically:
“An unknown error occurred while processing the certificate. Contact the site administrator”.
![](/sites/default/files/An%20unknown%20error%20occurred%20while%20processing%20the%20certificate%20-%20462011.png)
The cause: