SMB Client bug. Can't connect to smb shares on OSX Elcaptain

[Zimny's Brain]

Can't connect to smb shares on OSX Elcaptain

smbclient -L //osxhost/smbshare -U user
after proper creditenials:

session setup failed: NT_STATUS_INVALID_SIGNATURE

this happened after update

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: samba 2:4.3.9+dfsg-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 3.13.0-86.131-generic 3.13.11-ckt39
Uname: Linux 3.13.0-86-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.20
Architecture: amd64
Date: Tue May 24 12:17:09 2016
SambaClientRegression: Yes
SourcePackage: samba
UpgradeStatus: Upgraded to trusty on 2014-10-01 (600 days ago)

[Zimny's Brain (zimnysbrain)]

anyone is looking in this section at all?

[Zimny's Brain (zimnysbrain)]

the support is great from samba team ... :(
can't access network shares from few weeks
revert samba ver dasn't help as well

many thanks

[Zimny's Brain (zimnysbrain)]

issue still there
anyone can offer any kind of help at all?

already tried add/remove samba user, revert samba and sambaclient versions

still the same problem.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Zimny's Brain (zimnysbrain)]

no help received at all
looks like samba team completely ignore their users

unprofessional and simple rude

cheers

[Christian Ehrhardt  (paelzer)]

Hi,
I'm sorry that you got no samba support in time - yet I wanted to ask now if that might also be related to an ElCapitan update (or both actually).
See
https://github.com/videolabs/libdsm/issues/80

There is also a config workaround that you may want to try:
Adding the two lines

    <key>SigningRequired</key>
    <false/>
to /Library/Preferences/SystemConfiguration/com.apple.smb.server.plist and restarting the server (or switching SMB sharing off and on again) re-enables connectivity.

[Morbius1 (morbius1)]

If you don't want to muck about with the internals of the macOS box you can also bypass smbclient on the Linux box and connect to it with a CIFS mount:

sudo mount -t cifs //server/share /mountpoint -o username=xxx,password=yyy,uid=1000,nounix

[Stefan Metzmacher (metze)]

This looks like https://bugzilla.samba.org/show_bug.cgi?id=11994 which is already fixed a while ago

[Morbius1 (morbius1)]

To paraphrase a former US President it all depends on what the definition of "fixed" is.

In Xubuntu 17.04 Beta1 which uses 4.5.4 of samba it does appear to be fixed. But for Xubuntu 16.10 ( 4.4.5 ), Xubuntu 16.04 ( 4.3.11 ), and Xubuntu 14.04 ( 4.3.11 ) not so much.

Now the last two are LTS releases so you know .. it may come someday.

[Christian Ehrhardt  (paelzer)]

Hi,
I'm trying to clear a few old bugs and this sadly never came up again - neither via prio/people chiming in here nor in other places. Nowadays the server team has an improved triage process in place which would better catch the hint to the fix and probably create SRU uploads for this in time. But for Xenial/Trusty that is now - in 2021 - too late as they are in extended security maintenance now which this does not qualify for :-/.