Re: "Authentication failure" on Ubuntu 18.04...

[Billy MacAllister <bill@ca-zephyr.org>]

On Sat, 30 Mar 2019 16:44:31 -0400 (EDT)
Robert Heller <heller@deepsoft.com> wrote:

> I have a server running CentOS 6 on the bare metal, running the stock
> CentOS 6 OpenLDAP packages (openldap-2.4.40-16.el6.x86_64,
> openldap-clients-2.4.40-16.el6.x86_64, openldap-2.4.40-16.el6.i686,
> openldap-servers-2.4.40-16.el6.x86_64) [yes I know these are old, but
> they *work* -- "If it ain't broke, don't fix it."]. There are two VMs
> running on this server, one running Ubuntu 14.04 and the other Ubuntu
> 18.04. (These two VMs are/will be servers for DRBL.) The Ubuntu 14.04
> VM (and all of its diskless clients) are perfectly happy to talk to
> the OpenLDAP server (slapd) running on the CentOS 6 machine. The
> Ubuntu 18.04 VM is not. ldapsearch works everywhere though, so it is
> NOT the server or the core ldap libraries on any of the machines
> (partitularly the Ubuntu 18.04 VM). I can only assume that there is
> something fishy with nslcd or the pam/ldap libraries or config on the
> Ubuntu 18.04 VM. I have checked everything, but I am coming up
> empty.  I am thinking there might be some "trick" to getting LDAP
> Authentication to work under Ubuntu 18.04 that I am missing.
> 

I have many Bionic systems running nslcd without any problems.  I
don't think that it is nslcd that is the problem.

When you are debugging you should turn of nscd.  It just gets in
the way.  If it were me I would make sure that stats logging is on
on the LDAP server.  Then I would watch the LDAP server log as I
attemptes a login on the 18.04 system.

Bill