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[Samba] Using MS-DOS client

Hi, all.

I know this is ancient history, but I have a couple of DOS machines that host older device programming hardware. I've been able to access an older version of Samba for years without incident. Last weekend I upgraded my server to Ubuntu 18.04, which provides Samba 4.7.6. Unfortunately, after hours of frustration I find I'm unable to connect from any of the older machines. By cranking up debug, I can see this:

[2018/12/24 16:04:02.012369, 2] ../source3/auth/auth.c:332(auth_check_ntlm_password)
  check_ntlm_password:  Authentication for user [HIRSCH] -> [hirsch] FAILED with error NT_STATUS_WRONG_PASSWORD, authoritative=1
[2018/12/24 16:04:02.012420, 2] ../auth/auth_log.c:760(log_authentication_event_human_readable) Auth: [SMB,(null)] user []\[HIRSCH] at [Mon, 24 Dec 2018 16:04:02.012407 EST] with [LANMan] status [NT_STATUS_WRONG_ PASSWORD] workstation [vmdos] remote host [ipv4:] mapped to []\[hirsch]. local host [ipv4:192.168
[2018/12/24 16:04:02.012527,  2] ../auth/auth_log.c:220(log_json)
JSON Authentication: {"timestamp": "2018-12-24T16:04:02.012467-0500", "type": "Authentication", "Authentication": {" version": {"major": 1, "minor": 0}, "status": "NT_STATUS_WRONG_PASSWORD", "localAddress": "ipv4:", " remoteAddress": "ipv4:", "serviceDescription": "SMB", "authDescription": null, "clientDomain": "" , "clientAccount": "HIRSCH", "workstation": "vmdos", "becameAccount": null, "becameDomain": null, "becameSid": "(NULL SID)", "mappedAccount": "hirsch", "mappedDomain": "", "netlogonComputer": null, "netlogonTrustAccount": null, "netlogo nNegotiateFlags": "0x00000000", "netlogonSecureChannelType": 0, "netlogonTrustAccountSid": "(NULL SID)", "passwordType
": "LANMan"}}

But, the password IS correct and works fine from, e.g. smbclient on another Linux host. I've tried setting:

encrypt passwords = no

but it makes no difference (other than to prevent smbclient from working).

On the client, I'm getting 'Error 5'.

Here are my current global settings:

        workgroup = WORKGROUP
        netbios name = PII
        server string = %h server (Samba, Ubuntu)
        lanman auth = yes
        client lanman auth = yes
        ntlm auth = yes
        lm announce = yes
        lm interval = 30
        dns proxy = No
        encrypt passwords = yes
        username map = /etc/samba/smbusers
        log level = 1
        log file = /var/log/samba/log.%m
        preferred master = Yes
        domain master = Yes
        wins support = yes
        security = user
        passdb backend = tdbsam
        socket options = TCP_NODELAY
        idmap uid = 10000-20000
        idmap gid = 10000-20000
        template shell = /bin/bash
        usershare max shares = 100
        usershare allow guests = yes
        follow symlinks = yes
        wide links = yes
        unix extensions = no

The password was set using 'smbpasswd -a' and - as mentioned - works properly from other clients.

It is very important to me that I get MS-DOS access working again and would appreciate any advice or suggestions. This is for use only on a home LAN with all incoming outside connections blocked. Security is not a concern for me.


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