Cannot list users: "Communication failure" (LDAP auth)

Note: I've installed the OpenMediaVault package on a quite fresh Debian Wheezy (7.6).

My Debian box was already configured to do PAM-LDAP auth: users from my LDAP server can SSH to it just fine and both getent passwd and getent group returns the LDAP users and groups.

On OMV WebGUI, the Group tab works: all my groups are displayed with correct members. However the Users tab seems to hangs: after a while the interface displays a modal window with the message:

Quote

An error has occured
communication failure

As I want to benefits from OMV tools to set perms on Shared Folder I need to fix this.
I've tried to install the OMV LDAP plugin but it broke the PAM auth (could not SSH to the server using LDAP credentials anymore).

What log file should I look into to give you more useful infos on the problem?

Oups: just found out there was another topic with very similar issue:
OMV / LDAP Client

It contains useful infos that might resolve my issue: I will look into and test it ASAP.

Well, it looks like my issue is different from @Moimeme's: the UID and GID I use compatible with default settings.
I cannot test if my users (local and/or LDAP) are displayed or not on the "ACL List" because I cannot add Shared Folders" yet (it's an other issue).

But I've noticed that my /var/log/syslog file gets filled with lot of:

Quote

nslcd[23135]: [9f63fd] <group(all)> cn=sales,ou=Groupes,dc=example,dc=com: cn: denied by validnames option
nslcd[23135]: [9f63fd] <group(all)> cn=r_and_d,ou=Groupes,dc=example,dc=com: cn: denied by validnames option
nslcd[23135]: [9f63fd] <group(all)> cn=communication,ou=Groupes,dc=example,dc=com: cn: denied by validnames option

and less:

Quote

nslcd[23135]: [f69c3f] <group/member="john-doe"> cn=sales,ou=Groupes,dc=example,dc=com: cn: denied by validnames option

It really is the first time I run into theses error with PAM-LDAP setup: what would OMV try that would generate this kind of error?

Updating the thread because I am now on OMV v2.2.12, Debian Wheezy v7.11 and the problem still exists.

Still getting:

Quote from /var/log/syslog

nslcd[23135]: [9f63fd] <group(all)> cn=sales,ou=Groupes,dc=example,dc=com: cn: denied by validnames option
nslcd[23135]: [9f63fd] <group(all)> cn=r_and_d,ou=Groupes,dc=example,dc=com: cn: denied by validnames option
nslcd[23135]: [9f63fd] <group(all)> cn=communication,ou=Groupes,dc=example,dc=com: cn: denied by validnames option

and the web UI fails to list the users:

Quote from Web UI

An error has occured
communication failure

And fails to list the users when modifying a group:

Quote from Web UI

Error:
Gateway Time-out

I have about 460 users and 60 groups in the LDAP directory.

Debian recognize them (and I can log as them via SSH) :

getent passwd | wc -l

500

getent group | wc -l

120

Could it be a simple slow response issue?
The `getent passwd` commands takes less than a second to run.