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We want to support web browsers utilizing TLS 1.1 and 1.2, which has been apparently implemented by Microsoft, but is turned off by default.

So I went searching on Google and discovered some pages everyone seems to be following:



However! It doesn't appear to be working for me. I have set both DWORD vaules for DisabledByDefault and Enabled for TLS 1.1 and 1.2. I can confirm my client is attempting to communicate with TLS 1.2, but the server only responds with 1.0. I've restarted IIS, but it didn't change the situation.

Microsoft points out: "WARNING: The DisabledByDefault value in the registry keys under the Protocols key does not take precedence over the grbitEnabledProtocols value that is defined in the SCHANNEL_CRED structure that contains the data for an Schannel credential."

Well, that's very vague to me. I can't find anywhere where SCHANNEL_CRED is defined or set, all I can determine that it's a structure defined in a Microsoft library. That's my only guess for why this isn't work, yet I can't find enough information on it to determine if it is the true problem.

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I hate to ask the obvious, but did you reboot the server after changing the registry? –  Coding Gorilla Sep 23 '11 at 15:36
Hmmm. In IIS Manager, I clicked "Restart" under 'Actions'. –  Sam.Rueby Sep 23 '11 at 15:39
As @ShaneMadden indicated, these changes are deeper than IIS, so you need to restart the system to make sure all the changes are applied. –  Coding Gorilla Sep 23 '11 at 15:39

1 Answer 1

up vote 23 down vote accepted

Reboot. Changes to Schannel settings do not take effect until the system is rebooted.

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You're a professional. –  Sam.Rueby Sep 23 '11 at 15:49
I don't have the reputation to up-vote this. –  Sam.Rueby Sep 23 '11 at 17:16

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