I have a TMG 2010 (Forefront Threat Manager Gateway 2010) sitting on Windows Server 2003 R2 and I have several websites published through it. One of the websites is sitting on Windows Server 2012 R2. I know that Server 2003 R2 ships with TLS 1.0 and Server 2012 R2 ships with TLS 1.2. When I open the website from the internal network (not going through TMG) Google Chrome shows that the connection uses TLS 1.2. When, however, I open the published website from an external network (going through TMG), Google Chrome says the connection uses TLS 1.0.
How can I let the visitor not use TMG's TLS implementation but the version of the windows server on which the published site sits? Thanks in advance.