Fixing Vista and Windows 2000 Authentication Problems
This is a very well explanation to fix user authentication problem on windows Vista or windows 2000. Here is the simplified step by step to do it. On my Vista machine I opened the local policy editor (You can find this under administrative tools in the control panel).
Browse to Local Policies -> Security Options
Looking at:
Network Security: LAN Manager authentication level
I see that it only will allow NTLMv2 responses. Since I know that my physical network is protected, and I know all of the machines running on it I changed it to this:
Now I can connect to the admin$ share…and any other share on Windows 2000 computers.
This tip comes with a warning. Obviously dropping this down makes your Vista install less secure. If you think it is possible that you could have a rogue SMB server (A specially crafted windows share) on your network, I suggest not changing this. setting.
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