[Samba] NT_STATUS_DOWNGRADE_DETECTED

[Anantha Raghava]

Hi,

We recently upgraded to Samba Version 4.18.1 from 4.15.6.

While adding new users to Vcenter console, new user addition is getting 
refused. While assessing the problem we see a peculiar error in the log. 
This was working properly earlier with 4.15.6

The error log shows as follows:

{"timestamp": "2023-05-02T11:13:08.478955+0530", "type": 
"Authentication", "Authentication": {"version": {"major": 1, "minor": 
2}, "eventId": 4625, "logonId": "0", "logonType": 3, "status": 
"NT_STATUS_DOWNGRADE_DETECTED", "localAddress": 
"ipv4:172.16.202.175:445", "remoteAddress": "ipv4:172.16.223.16:35096", 
"serviceDescription": "NETLOGON", "authDescription": 
"ServerAuthenticate", "clientDomain": "KTKBANKLTD", "clientAccount": 
"KBLVCENT-TUZ6BW$", "workstation": null, "becameAccount": &quo 
t;KBLVCENT-TUZ6BW$", "becameDomain": "KTKBANKLTD", "becameSid": null, 
"mappedAccount": "KBLVCENT-TUZ6BW$", "mappedDomain": null, &quo 
t;netlogonComputer": "KBLVCENT-TUZ6BW", "netlogonTrustAccount": 
"KBLVCENT-TUZ6BW$", "netlogonNegotiateFlags": "0x6007FFFF", 
"netlogonSecureChannelType": 2, "netlogonTrustAccountSid": null, 
"passwordType": "HMAC-MD5"}}

Samba is installed on RHEL 8

our smb.conf shown below.

*smb.conf*

# Global parameters
[global]
         netbios name = PDC
         realm = KTKBANKLTD.COM
         server role = active directory domain controller
         workgroup = KTKBANKLTD
         idmap_ldb:use rfc2307 = yes
         ldap server require strong auth = No
         dns forwarder = x.x.x.x
         allow dns updates = nonsecure
         tls priority = NORMAL:-VERS-TLS-ALL:+VERS-TLS1.2
         log level = 3 auth_audit:0 auth_json_audit:3 dsdb_json_audit:5
         log file = /var/log/samba/pdc.log
         max log size = 1000000000

[sysvol]
         path = /usr/local/samba/var/locks/sysvol
         read only = No

[netlogon]
         path = /usr/local/samba/var/locks/sysvol/ktkbankltd.com/scripts
         read only = No

Request someone to help us fix the issue.

-- 

Thanks & Regards,

Raghav


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