IE8 cannot view sites that share certificate on one IP from IIS 7.5

James asked:

I have multiple sites with different root domains that use use the same IP/port and certificate on IIS 7.5.

With firefox, chrome, and IE9 it works fine. But IE8 users experience the error:–

**Internet Explorer cannot display the webpage.**

HTTP works fine but not SSL.

Is there a way to get this work without having users upgrade to IE9 or use another browser?

My answer:

Using the same IP address for multiple secure web sites requires Server Name Indication, a TLS extension. Its primary drawback, however, is that no version of Internet Explorer on Windows XP supports it. If you intend to support such clients, you will need unique IP addresses for each host.

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