Thanks, I'll try this when I get a chance and report back.

On Thu, Jan 30, 2014 at 11:43 AM, Warron S French <> wrote:
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Joshua, were you able to get TLS configured and your clients were specifically Debian?  I ask, because my clients were CentOS which is downstream from Red Hat.

Try using ldapmodify with -v and -d ## set along with the other arguments and syntax; do you still see no more verbosity?  I did, I wonder if you will see what I discovered.

I ran the following command:

ldapmodify    -x     -D "cn=admin,cn=config" -W -d 32768 -f /tmp/LDAP-CONFIG-TLS.ldif

However, I was also running slapd with -d 32768 as an argument as well.  I don't know if it makes any difference, but I was not using GnuTLS, but OpenSSL.

Warron French, MBA, SCSA

From:        Joshua Schaeffer <>
To:        c chupela <>,
Cc:        "" <>
Date:        01/30/2014 12:05 PM
Subject:        Re: Antw: problem with accessing secure ldap
Sent by:

I think I'm running into this right now.  I just setup ldaps a couple days ago, but I can't get any of my clients to connect to it.  I can see my openldap server listening on port 636 and I can telnet to that server and port from another machine successfully, but I still get this error:

ldap_sasl_bin(SIMPLE): Can't contact LDAP server (-1)

the verbose option doesn't give me much more useful information than that.  I have a hunch that it has to do with the certificates, but I'm using GnuTLS as I'm on Debian and the slapd package since lenny is only compiled against GnuTLS.  What was the command you ran to get this output?

On Thu, Jan 30, 2014 at 9:09 AM, c chupela <> wrote:
further troubleshooting on my part with ldapsearch/debugging turned up, gave me the following:

TLS: certdb config: configDir='/etc/openldap/certs' tokenDescription='ldap(0)' certPrefix=" keyPrefix=" flags=readOnly
TLS: using moznss security dire /etc/openldap/certs prefix
TLS: error: tlsm_PR_Recv returned 0 - error 21:Is a directory
TLS: error: connect - force handshake failure: errono 21 - moznss error -5938
TLS: can't connect: TLS error -5938:Encountered end of file
ldap_sasl_bin(SIMPLE): Can't contact LDAP server (-1)

searches I;ve done on this error seem to point to certificate/openSSL problems.

Anyone run into this before?

On Friday, January 24, 2014 5:39 PM, c chupela <> wrote:
After having some packet traces done, what was revealed is that from a windows client running the softerra ldap browser, we could see the connection be established between client and server (syn, ack synack) client requests sending of data, and server resets/closes the connection, never sending any data,  as I also saw with attempting to telnet to port 636 - connection is closed by remote host.

Regarding the question of is TLS enabled, if I understand the doc correctly, the answer is yes.  With respect to the TLS_REQCERT never statement, I believe it was set this way because this was only intended to be a testing server. 

contents of ldap.conf:

# LDAP Defaults

# See ldap.conf(5) for details
# This file should be world readable but not world writable.

BASE    dc=plandb,dc=stuff,dc=acme,dc=com
URI     ldap:// ldaps://

#SIZELIMIT      12
#TIMELIMIT      15
#DEREF          never

TLS_CACERTDIR   /etc/openldap/certs
TLS_REQCERT     never

currently running slapd process:

1 S ldap      5603     1  0  80   0 - 111440 futex_ Jan21 ?       00:00:02 /usr/sbin/slapd -h  ldap:/// ldaps:/// ldapi:/// -u ldap

On Thursday, January 23, 2014 3:25 AM, Ulrich Windl <> wrote:
>>> c chupela <> schrieb am 22.01.2014 um 18:43 in Nachricht
> I've been tasked with figuring out why a redhat 6.4 server w/openldap v2.4.23
> is not accessible.
> This server is a test server. I have a production server that is working
> properly, and I've gone thru and compared config files, etc, but haven't
> found any differences.
>  I'm a newbie with this, so my understanding is still somewhat limited. 
> Here's what I've done or checked so far:
> - iptables is not running
> - if I run netstat, I can see port 389/port 636 in listening state:
> tcp        0      0      *                 
> LISTEN      5603/slapd
> tcp        0      0      *                 
> LISTEN      5603/slapd
> tcp        0      0 :::636                      :::*                       
> LISTEN      5603/slapd
> tcp        0      0 :::389                      :::*                       
> LISTEN      5603/slapd
> I can telnet to port 389 on this server from another server, but not to port
> 636 - putty will throw back an immediate 'connection closed by remote host'
> message.
> I'm not seeing any slapd related messages in /var/log/messages.
> What else can I check on here?


> Thanks
> Chris

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