WinHTTP Cipher restrictions to TLSv1.2 does not work on Windows7, Server 2008 R2 and Server 2012…

This will bite me some time for sure, so for my link archive: [WayBack] TRestClient and Cipher restrictions to TLSv1.2 does not work on Windows7 and Server2008R2 … and how it can be solved… – Günther Schoch – Google+

References:

• [WayBack] Support for SSL/TLS protocols on Windows – Unleashed
• [no WayBack or Acrhive.is] Update to enable TLS 1.1 and TLS 1.2 as a default secure protocols in WinHTTP in Windows: Describes an update that adds TLS 1.1 and TLS 1.2 to default security protocols in Windows Server 2012, Windows 7 SP1, and Windows Server 2008 R2 SP1.

For at least some Windows 7 and Server 2008 R2 systems, that update (KB3140245) doesn’t automatically turns up in the Windows Update list.

To make matters worse, the page cannot be archived in either the WayBack machine or Archive.is (I tried multiple times with empty results).

Luckily, there is a copy at [WayBack] KB3140245 DefaultSecureProtocols – Security.NL.

After installing the update, you have to ensure you set the DefaultSecureProtocols registry value to the bitmap value that indicates with SSL/TLS versions you want to support:

The DefaultSecureProtocols registry entry can be added in the following path:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp

On x64-based computers, DefaultSecureProtocols must also be added to the Wow6432Node path:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp

The registry value is a DWORD bitmap. The value to use is determined by adding the values corresponding to the protocols desired.

DefaultSecureProtocols Value	Protocol enabled
0x00000008	Enable SSL 2.0 by default
0x00000020	Enable SSL 3.0 by default
0x00000080	Enable TLS 1.0 by default
0x00000200	Enable TLS 1.1 by default
0x00000800	Enable TLS 1.2 by default

For example:

The administrator wants to override the default values for WINHTTP_OPTION_SECURE_PROTOCOLS to specify TLS 1.1 and TLS 1.2.

Take the value for TLS 1.1 (0x00000200) and the value for TLS 1.2 (0x00000800) then add them together in calculator (in programmer mode), the resulting registry value would be 0x00000A00.

–jeroen