[Samba] Windows 10 and Samba 4 and max protocol

[Gaiseric Vandal]

I recently updated my samba domain controllers (classic domain) from 3.6.25
to 4.4.7.    Windows 7 and 2008 clients are OK.       On Windows 10 , users
were unable to login.        The "max protocol" default had changed from
"NT1" to "SMB3."       Setting back to "NT1" fixed the issue (following a
quick google search.)   

 

 

In the past Windows 7 and 2008 had issues with file shares with SMB2
(although authentication was not an issue.)

 

 

This is a little counter-intuitive for me.  If anything, I would have
thought Windows 7 might have issues with SMB3 enabled on the DC and Windows
10 would be AOK.   My guess is windows 10 tries SMB3  (if offered by the
server) and chokes on it.      SMB is  primarily a file sharing protocol,
not an authentication protocol,  so I think that user authentication
succeeded but that access to the IPC$ share failed.    There don't seem to
be any "server ipc protocol" options.    

 

This isn't really a major issue for now but I some point I would like to
move samba file servers to smb2 or smb3 for the expected improved
performance.