Windows 2003 and earlier versions do not support SHA2 by default. The administrator must apply the Microsoft hotfix to enable SHA2 support. Solution Microsoft has created a hotfix for Windows 2003 that addresses this issue.
See the following Microsoft links for details of how to obtain the hotfix.
Microsoft KB # 968730 (http://support.microsoft.com/kb/968730) Microsoft KB # 938397 (http://support.microsoft.com/kb/938397)