[Samba] mount.cifs STATUS_NO_LOGON_SERVERS

[Rowland Penny]

On Wed, 2021-08-11 at 15:01 +0200, Mark Amundsen via samba wrote:
> Hello all
> 
> I have a Samba AD DC and a Samba Fileserver. Shares on the latter is
> mainly served to W10 clients (they are also members of the samba-
> domain). All this works.
> 
> Then there is a linux box that mounts a few shares on the fileserver
> with mount.cifs, this used to work for several years but stopped
> working a few days back (most likely after an apt upgrade but
> unfortunately I didn’t notice it break at the moment).

Is the 'linux box' joined to the domain ? If not, why not ?

> 
> I have the credentials in a file (/etc/cifs-utils/cifspasswd):
> username=me at domain.example.com
> password=thesecret
> 
> mount -t cifs -o credentials=/etc/cifs-utils/cifspasswd
> //fileserver/data /mnt/samba
> returns Status code returned 0xc000005e STATUS_NO_LOGON_SERVERS
> 
> However, this works:
> smbclient -A /etc/cifs-utils/cifspasswd //fileserver/data
> 
> I’ve tried to change the credential-file to
> username=me 
> password=thesecret
> domain=domain.example.com
> 
> but then smbclient says: gensec_spnego_client_negTokenInit_step:
> gse_krb5: creating NEG_TOKEN_INIT for cifs/sneezy failed
> (next[(null)]): NT_STATUS_NO_MEMORY

Anything with 'krb5' in it, means kerberos

> and mount.cifs STATUS_NO_LOGON_SERVERS as before

It is probably looking for a KDC

> 
> If I type an invalid password smbclient also says
> NT_STATUS_NO_LOGON_SERVERS
> 
> I am aware that this might not be an issue with samba, I just hope
> that some kind soul will kick me out in the right direction :)
> 
> Any hints on how to troubleshoot this would be much appreciated!
> Samba version is 4.14.6
> mount.cifs is 6.8 (debian)
> smbclient is 4.9.5-Debian
> os on all three is debian 10.10 with Linux 4.19.0-17-amd64
> 

Lets start by you posting the smb.conf from all three machines (hint:
post the output from 'samba-tool testparm --suppress-prompt' on the DC
and 'testparm -s' on the others)

Rowland