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security - Enabling cipher TLS_RSA_WITH_3DES_EDE_CBC_SHA (0xa) on Windows Server 2003+ISA 2006

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I have been given a task to disable
all "weak" ciphers/protocols on our very old ISA server based on Windows Server 2003. I
have disabled all protocols but TLS1.0, and all ciphers but RC2/128, RC4/128 and Triple
DES 168/168. But Qualys SSL Labs test utility does not display me that I have a 3DES
encryption available on my ISA server. The only cipher suites listed
are:



TLS_RSA_WITH_RC4_128_MD5
            (0x4) 
TLS_RSA_WITH_RC4_128_SHA (0x5)


href="http://support.microsoft.com/kb/245030" rel="nofollow noreferrer">This
KB says that when Triple DES 168 cipher is enabled, the
TLS_RSA_WITH_3DES_EDE_CBC_SHA cipher suite is available. However, it is not. We need
this cipher suite to allow a Windows 8.1 Phone connecting to ActiveSync published by
this ISA. What could be the reason of 3DES encryption to be unavailable in this
configuration, and what should we do in order to allow the connection for a Windows 8.1
phone without being vulnerable to
POODLE?




EDIT: There was apparently a
server-side malfunction of some sort, a reboot fixed 3DES availability, although the
same KB states that registry change should have worked at once. I've got another server
with the same problem, got it fixed with registry modification only,
though.



Answer




If your registry change didn't take effect
immediately, then just restart your computer.



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