Hello Steve, On Wed, Mar 20, 2019 at 10:44 PM Steve French <smfrench@xxxxxxxxx> wrote: > > Looks like you have "server signing = mandatory" in > /etc/samba/smb.conf on the server. Is that true? That (in theory) > should not work with guest according to the protocol specification but > I am comparing with 4.19 behavior to see what changed (maybe we > ignored 'sign' if guest?) I have the defaults for samba 4.10: root@ubuntu:~# testparm -sv|grep signing Load smb config files from /etc/samba/smb.conf Loaded services file OK. Server role: ROLE_STANDALONE client ipc signing = default client signing = default server signing = default According to the manpage[1], "server signing = default" means: """ By default, and when smb signing is set to default, smb signing is required when server role is active directory domain controller and disabled otherwise. """ So it should be disabled in this case. 1. https://www.samba.org/samba/docs/current/man-html/smb.conf.5.html#idm8588