Not sure how to read them really (below), but it looks like the system didn't like the fact that I didn't select anything for the SMB3 Transport Encryption. (Not sure why it let me click "Apply" if that preference was required.)

I selected "Enable" "Globally" and it seems to have turned on SMB now (I can now see the NAS in Windows), but I don't really know what I've done by saying "Enable" "Globally". I only access this NAS internally on my own network and don't need to encrypt anything to or from it. Translation anyone?

Thanks.

smbstatus.log...

using configfile = /etc/samba/smb.conf

Samba version 4.8.0
PID Username Group Machine Protocol Version Encryption Signing
----------------------------------------------------------------------------------------------------------------------------------------

Service pid Machine Connected at Encryption Signing
---------------------------------------------------------------------------------------------

/var/lock/samba/locking.tdb not initialised
This is normal if an SMB client has never connected to your server.

smbd.log...

[2021/10/03 10:51:44.866410, 0] ../lib/util/become_daemon.c:136(daemon_ready)
daemon_ready: daemon 'smbd' finished starting up and ready to serve connections
[2021/10/03 10:51:54.544415, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:52:46.965235, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:53:45.422768, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:54:45.903972, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:55:46.386421, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:56:46.868880, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:57:47.351811, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:58:45.825531, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 10:59:46.331182, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 11:00:46.814029, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 11:01:47.296765, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 11:02:45.762896, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:03:46.246039, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:04:46.733469, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:05:02.779225, 0] ../lib/util/become_daemon.c:136(daemon_ready)
daemon_ready: daemon 'smbd' finished starting up and ready to serve connections
[2021/10/03 13:05:02.794793, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:06:03.275737, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:06:22.894014, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:07:03.752399, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:07:03.757853, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:07:03.758874, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:07:51.495624, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:07:51.501013, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:07:51.502030, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Elizabeth] -> [Elizabeth] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:09:16.859362, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:09:16.870615, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:09:16.870884, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [root] -> [root] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/03 13:14:51.689575, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:17:02.824560, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:21:46.901330, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:21:46.904475, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:21:47.188496, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:21:47.191625, 2] ../source3/auth/auth.c:314(auth_check_ntlm_password)
check_ntlm_password: authentication for user [admin] -> [admin] -> [admin] succeeded
[2021/10/03 13:22:56.706666, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:22:56.708407, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/03 13:22:56.712910, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/04 19:45:57.985359, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/04 19:45:57.988774, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/04 19:45:58.045975, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:51.545866, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:51.571569, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:51.584307, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:51.648492, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:51.651361, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:51.656618, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:56.923554, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:56.925357, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:56.932154, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/06 16:55:56.932486, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/08 11:36:20.307445, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:20.353976, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:20.388911, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:20.461276, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:20.468167, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:20.475229, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:25.187925, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:25.189746, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:25.202650, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/08 11:36:25.203057, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [Guest] -> [Guest] FAILED with error NT_STATUS_NO_SUCH_USER, authoritative=1
[2021/10/09 02:02:44.927141, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/09 02:02:44.929725, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/09 02:02:44.956889, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/09 02:02:56.065877, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/09 02:02:56.068620, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/09 02:02:56.074922, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 07:42:18.413754, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 07:42:18.415598, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 07:42:18.419879, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 09:33:58.433525, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 09:33:58.435372, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 09:33:58.439657, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 09:49:51.111011, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 09:49:51.112864, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 09:49:51.117258, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 12:19:48.694522, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 12:20:32.366514, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 12:20:33.144348, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 12:20:44.460131, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 12:20:45.845830, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/10 20:17:06.450354, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 08:48:41.337567, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 08:49:19.486345, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 08:49:47.296332, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 08:53:16.732546, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 09:03:01.816502, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 09:17:55.640982, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 09:22:47.292838, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 09:22:55.766860, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 09:23:27.116610, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 09:35:34.547518, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'
[2021/10/13 14:17:28.675562, 0] ../lib/param/loadparm.c:1121(lp_set_enum_parm)
WARNING: Ignoring invalid value '(null)' for parameter 'smb encrypt'

Forum Discussion

CM1200 Dropping connection intermittently - SYNC Timing Synchronization failure