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According to Microsoft document MS-NLMP, current flags usage is not accurate: flag NTLMFLAG_NEGOTIATE_NTLM2_KEY controls the use of extended security in an NTLM authentication message and NTLM version 2 cannot be negotiated within the protocol. The solution implemented here is: if the extended security flag is set, prefer using NTLM version 2 (as a server featuring extended security should also support version 2). If version 2 has been disabled at compile time, use extended security. Tests involving NTLM are adjusted to this new behavior. Fixes #6813 Closes #6849