Samba 4.11.x has landed in the -unstable repo and will be synced to stable along with the GNOME-3.36 stack upgrade.
For most users, this will be a non-event, as everything should just work as usual.
However, since SMB1 is now officially deprecated by upstream, they can no longer guarantee that SMB1 will keep working, which means that any workarounds in place locally to downgrade to SMB1 might stop working with no notice in the future.
Consider yourselves warned.
Therefore, users still relying on SMB1 who might be affected by this are strongly urged to upgrade to at least the SMB2_02 protocol (introduced with Windows Vista / Server 2008) when connecting to other Samba instances if they can, as some older network appliances support this version in addition to SMB1.
In my latest commit I've downgraded the Solus Samba minimum allowed protocol from SMB2_10 to SMB2_02 to make things as simple as possible for users.
If you need to configure other non-Solus Samba clients on your network to use SMB2_02, the appropriate incantations in
/etc/samba/smb.conf look like this:
client ipc min protocol = SMB2_02
client min protocol = SMB2_02
For shares on non-Solus Samba servers, the necessary incantation in
/etc/samba/smb.conf looks like this:
server min protocol = SMB2_02
If you want to understand which protocol is negotiated with a Samba server and which version of Samba the server runs, you can add/edit the following stanza in the [global] section for the server in question:
server string = Samba server (version: %v, protocol: %R)
(All of the above configuration parameters are already present in the default Solus Samba configuration)
EDIT: Updated OP to reflect new defaults with samba-4.11.7-62 which was just published to -unstable.