Configure Samba for Windows 3.1

Before you begin, you should know that SMB1 is very insecure. Only do this on a Samba server that is only accessible locally and not accessible from the internet. Also, an SMB account should already be set up in Samba using smbpasswd.

Edit /etc/samba/smb.conf and make sure the following lines exist:

[global]
  client min protocol = CORE
  server min protocol = CORE
  client plaintext auth = yes

Then, systemctl reload smbd.service.