Failure Reason: An Error occured during Logon.
Status: 0xc0000225
Sub Status: 0x0
This occurred attempting to connect a CIFS mount from Red-Hat Linux to Windows Server 2008 R2. The mount had worked in Server 2003 but failed on 2008 R2. I discovered the following registry hotfix that addresses the issue which I confirmed with a network trace was exactly as described in KB 957441:
Client connections return a "STATUS_INVALID_PARAM" error code when you use a "Send NTLMv2 response only" authentication level in Windows Server 2008 or in Windows Vista
http://support.microsoft.com/kb/957441
In this case the status seems to be a generic indicator of "something is wrong with the NTLM negotiation."