[Samba] mount cifs

[lists]

Found some more info:

mount.cifs to mount shares from my DCs (samba 4.2.11) works
mount.cifs to mount shares from smbserver (also 4.2.11) does NOT work.

Here is the debug log it produces:

> root at epo:/proc/fs/cifs# mount.cifs //smbserver.domain.com/share /mnt -o username=username,domain=WRKGRP,sec=ntlmsspi
> Password:
> Apr 19 15:19:58 epo kernel: [74522.479080] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/cifsfs.c: Devname: //smbserver.domain.com/share flags: 0
> Apr 19 15:19:58 epo kernel: [74522.479098] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: Domain name set
> Apr 19 15:19:58 epo kernel: [74522.479103] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: Username: username
> Apr 19 15:19:58 epo kernel: [74522.479111] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: file mode: 0x1ed  dir mode: 0x1ed
> Apr 19 15:19:58 epo kernel: [74522.479229] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: CIFS VFS: in cifs_mount as Xid: 133 with uid: 0
> Apr 19 15:19:58 epo kernel: [74522.479234] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: UNC: \\smbserver.domain.com\share ip: 1.2.3.4
> Apr 19 15:19:58 epo kernel: [74522.479268] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: Socket created
> Apr 19 15:19:58 epo kernel: [74522.479272] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: sndbuf 16384 rcvbuf 87380 rcvtimeo 0x6d6
> Apr 19 15:19:58 epo kernel: [74522.479748] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/fscache.c: cifs_fscache_get_client_cookie: (0xffff88105ddb8000/0xffff88085cdf6c00)
> Apr 19 15:19:58 epo kernel: [74522.479758] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: CIFS VFS: in cifs_get_smb_ses as Xid: 134 with uid: 0
> Apr 19 15:19:58 epo kernel: [74522.479763] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: Existing smb sess not found
> Apr 19 15:19:58 epo kernel: [74522.479776] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/cifssmb.c: secFlags 0x1081
> Apr 19 15:19:58 epo kernel: [74522.479780] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/cifssmb.c: NTLMSSP only mechanism, enable extended security
> Apr 19 15:19:58 epo kernel: [74522.479788] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: Demultiplex PID: 13704
> Apr 19 15:19:58 epo kernel: [74522.479798] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/transport.c: For smb_command 114
> Apr 19 15:19:58 epo kernel: [74522.479809] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/transport.c: Sending smb:  total_len 82
> Apr 19 15:19:58 epo kernel: [74522.491173] /build/linux-4wkEzn/linux-3.2.68/fs/cifs/connect.c: Received no data or error: expecting 4 got 0
> mount error(112): Host is down
> Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
> root at epo:/proc/fs/cifs#

And even though mount.cifs complains and refuses to mount stuff, the 
smbserver ACTUALLY works fine, all windows clients map their drives to 
it, I can also browse it with smbclient. It's just mount.cifs that 
complains.

As for smb.conf options: similar on the DCs and the smbserver, with:

server signing = mandatory
ntlm auth = yes
server min protocol = SMB2
client max protocol = SMB3

Any ideas why mount.cifs doesn't connect to our smbserver?

MJ