LAN Manager authentication level

Some smb shares on linux server works with Windows 7 and some has authentication issue.  All works with windows XP.  I had to set to "send LM and NTLM response" under local security policy for the client computer for it to connect to the linux file server.  Why do I have to set manually, why isn't this default on windows 7, and what would prompt some linux server to work and some to not?

LM and NTLM version 1 are extremely insecure methods of password hashing. All versions of Windows and server include backward compatibility for older versions of Windows and applications. As we see newer operating systems (like Win 7) they will default to a more secure method to help protect the password hashes. Therefore, when using Windows 7 you will likely need to force it to use this backward compatibility if you are connecting to something that doesn't support the newer methods like NTLM v2 or Kerberos.

As for your specific situation; are the Linux servers running different distributions or different versions of Samba? That is the most likely case and therefore only some of them will have the support necessary.

Read more :  lan manager authentication level windows 7

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