KB957441

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.

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