Web site security warning on all HTTPS web sites with TMG 2010

The most common cause for this error while accessing all HTTPS web sites is because the client workstation doesn’t trust the certificate that TMG is using. The CA certificate (e.g. self signed certificate) used by TMG must be deployed on the client, otherwise the client won’t trust the certificate issued by TMG on behalf of the web server. Read Deploying the HTTPS inspection trusted root CA certificate to client computers from TMG Documentation on TechNet for more information on how to deploy the CA certificate to the clients.



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