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ITsVISTA KB-Link: KB957441

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

You set the LAN Manager authentication level to Send NTLMv2 response only on a Windows Server 2008-based or Windows Vista-based computer. When a client connects to this computer without extended security support, the connection may fail and return a “STATUS_INVALID_PARAM” error code.

In this scenario, the SmbSessionSetup() function has failed.

Note: This problem does not occur on a Windows Server 2003-based or Windows XP-based computer if you configure the same LAN Manager authentication level.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB957441.

Fix It
Microsoft has a way to automatically fix this problem, click the "Fix It" image to go to the Knowledge Base page that contains the download.

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