Samba 4.11 removes SMB1 file-sharing protocol version by default

Jeremy Allison - Sam writes: For Samba version 4.11.0 we'll be disabling SMB1 on the server by default. Code is still there and can be turned by on in the config file though.

From the WHATSNEW.txt change git commit:

+SMB1 is disabled by default
+---------------------------
+
+The defaults of 'client min protocol' and 'server min protocol'
+have been changed to SMB2_02.
+
+This means clients without support for SMB2 or SMB3 are no longer
+able to connect to smbd (by default).
+
+It also means client tools like smbclient and other,
+as well as applications making use of libsmbclient are no longer
+able to connect to servers without SMB2 or SMB3 support (by default).
+
+It's still possible to allow SMB1 dialects, e.g. NT1, LANMAN2
+and LANMAN1 for client and server, as well as CORE and COREPLUS on
+the client.
+
+Note that most commandline tools e.g. smbclient, smbcacls and others
+also support the --option argument to overwrite smb.conf options,
+e.g. --option='client min protocol=NT1' might be useful.
+
+As Microsoft no longer installs SMB1 support in recent releases
+or uninstalls it after 30 days without usage, the Samba Team
+tries to get remove the SMB1 usage as much as possible.
+
+SMB1 is officially deprecated and might be removed step by step
+in the following years. If you have a strong requirement for SMB1
+(except for supporting old Linux Kernels), please file a bug
+at https://bugzilla.samba.org/ and let us know about the details.