[Samba] After upgrade samba 4.16 -> 4.18, unable to access cifs-shares exported from a netapp-server

[Jeremy Allison]

On Thu, Jun 08, 2023 at 10:53:58AM +0100, Rowland Penny via samba wrote:
>
>
>On 08/06/2023 10:36, gizmo via samba wrote:
>>
>>Hallo,
>>yesterday we made an upgrade from samba 4.16 to 4.18 (ubuntu 22.04 + sernet).
>>After the upgrade, all CIFS-Shares exported from our NetApp couldn't be accessed anymore neither from windows
>>nor from linux.
>
>Your NetApp doesn't 'export' anything, it (like every other NAS) just 
>supplies shares that other clients can connect to, it is a server
>>
>>The NetApp-Server reported the following errors:
>>
>>secd.netlogon.noServers: None of the Netlogon servers configured for Vserver (svm) are currently accessible via the network
>>secd.ldap.noServers: None of the LDAP servers configured for Vserver (svm) are currently accessible via the network
>>secd.lsa.noServers: None of the LSA servers configured for Vserver (svm) are currently accessible via the network
>>
>>It's like the NetApp-server were not able anymore to connect to the samba4-server
>
>It certainly looks that way.
>
>>
>>Because the CIFS-shares are essential, we had to act fast and went back to samba 4.16 from the backup.
>>Then everything worked fine again.
>
>It certainly looks like the upgrade changed something that your NetApp 
>didn't like.
>
>>
>>Is there any change in samba 4.17 or 4.18 that can cause this behave ?
>>I read the changelog, but couldn't find anything (with my minimal understanding)
>
>Like you, I cannot see anything relevant.
>
>Does your NetApp run vanilla Samba or its own version ?
>What is the smb.conf on the upgraded machine, which I presume wasn't 
>changed during the upgrade.

NetApp runs their own custom proprietary code. We
often have problems with them as they don't (as
far as I can tell) do regression CI testing against
anything other than stock Windows.