Is there a possibility to enable TLS 1.2 on IIS that will take effect only for specific website (instead the whole server)?

Posted on 2015-02-22
Medium Priority
Last Modified: 2016-05-13
We would like to upgrade our security but have couple of sites and specifically change 1 website on IIS to use TLS 1.2 (without the option of backward compatibility , meaning this specific site wont communicate on SSL3, TLS 1.0 ,  TLS 1.1 ) while the rest of the websites will still use TLS 1.0
Question by:safendsupport
1 Comment
LVL 66

Accepted Solution

btan earned 2000 total points
ID: 40624937
It is probably to look into the SNI for SSL binding to the particular website since likely they are hosting same IP and port , the hostname will be used to differentiate and serves out their respective server cert. E.g. client sending the Server Name header in its SSL Client Hello. If this is not supplied in the client TLS negotiation then http.sys will reset the connection.

And if the server cert is of TLS cipher based and SSL negotiation is disabled, maybe it can still be viable. Pls see below too. So far, I have yet to see binding in selective of cipher to specific website unless an application proxy is used to perform that enforcement - e.g. Citrix and F5 application proxy per se

SSL Handshake and HTTPS Bindings on IIS
he client sends the server the hostname it is requesting for as a part of the CLIENT HELLO in the form of TLS EXTENSIONS.

Server Name Indication (SNI) with IIS 8 (Windows Server 2012)
The server checks the registry to find a certificate hash/thumbprint corresponding to the above combination of IP:Port. The server checks the below key to find the combination: HKLM\SYSTEM\CurrentControlSet\Services\HTTP\Parameters\SslBindingInfo

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