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?

  • Get them off Windows XP? Dec 7, 2012 at 16:32
  • Thanks for the idea, but we have no control over the users machines.
    – James
    Dec 7, 2012 at 16:54
  • Then you can't use SNI. Dec 7, 2012 at 17:01
  • So using a multi-domain certificate (with multiple subj alt names) requires SNI? I thought IIS 7.5 doesn't support SNI? Thanks.
    – James
    Dec 7, 2012 at 17:15
  • No, using the same IP address requires SNI. Dec 7, 2012 at 17:16

2 Answers 2


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.


Try: Selecting the compatibility view icon, located to the right of the address bar, then refresh.

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If this works. Then select tools menu and click compatibility view settings then select select the display all websites in compatibility view check box OR all Intranet sites

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