When accessing a file share on a remote computer or device, Windows Vista will refuse to send your password using older encryption methods.
Unfortunately, many NAS devices as well as older versions of linux do not understand the newer encryption methods. This keeps you from being able to access these devices.
The solution is to force Windows Vista to use the older encryption methods. To do that, follow these steps:
Users of Windows Vista Home Basic and Home Premium: Click start Type: regedit Press enter In the left, expand these folders: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ In the left, click on the folder named: Lsa In the right, double-click “LmCompatibilityLevel” Type the number 1 and press enter Restart your computer.
Users of Windows Vista Business, Enterprise, and Ultimate: Click Start Click Control Panel Click System and Maintenance Click Administrative Tools Double-Click Local Security Policy In the left pane, click the triangle next to Local Policy In the left pane, click Security Options In the right pane near the bottom, double-click “Network security: LAN manager authentication level” Click the drop-down box, and click “Send LM & NTLM - use NTLMv2 session security if negotiated” Click OK.