This is a long shot. I am looking for a hotfix that allows Windows Server 2003 to connect to websites using SHA256 (SHA2) SSL. I found a number of articles that reference it, but they all point to this page which gets a 404 error: http://support.microsoft.com/kb/968730
KB968730 was replaced by KB3072630 which is the reason you are unable to find KB968730 anywhere. KB3072630 will automatically be installed through Windows Update
I searched extensively but it seems to be nowhere to be found on the Microsoft site, or anywhere else that I can find. Does anyone know where it can be found, or if you have it, maybe post it somewhere for download?
KB3072630is actually the patch you want. This is confirmed by the fact the file version for Crypt32.dll, is 5.131.3790.5668, which contains the necessary fix.
Source: Enabling SHA2 Certificate Support on Windows Server 2003