On a Member Server or DC, where "client max protocol" isn't defined in smb.conf, testparm shows "NT1" as used default value: # testparm -sv 2>/dev/null | grep "client max protocol" client max protocol = NT1 But the manpage says: client max protocol (G) ... Default: client max protocol = SMB3 Which is right?
Fixed in Samba 4.2 with c0ba1f3c8b6145950a44c71726d99470f0b50d64