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I have configured my openldap server in ldaps mode. But after configuring I am not able to connect it on 636 port where as I am able to connect on 389 port

[root@testldap certs]# ldapsearch -x -LLL -h testldap.india.airwave.com -p 636 -D  cn=Manager,dc=india,dc=airwave,dc=com -w  whopee   -b "ou=Users,dc=india,dc=airwave,dc=com"

ldap_result: Can't contact LDAP server (-1)

[root@testldap certs]# ldapsearch -x -LLL -h testldap.india.airwave.com -p 389 -D  cn=Manager,dc=india,dc=airwave,dc=com -w  whopee   -b "ou=Users,dc=india,dc=airwave,dc=com"

dn: ou=users,dc=india,dc=airwave,dc=com

objectClass: organizationalUnit

ou: users



dn: cn=Sandeep Lade,ou=users,dc=india,dc=airwave,dc=com

cn: Sandeep Lade

sn: Lade

objectClass: inetOrgPerson

userPassword:: d2hvcGVl

uid: vlade



dn: cn=Engineering,ou=users,dc=india,dc=airwave,dc=com

cn: Engineering

objectClass: groupOfNames

member: cn=Sandeep Lade,ou=users,dc=india,dc=airwave,dc=com

Both 389 and 636 are listening

[root@testldap certs]# netstat -an | grep 389

tcp        0      0 0.0.0.0:389                 0.0.0.0:*                   LISTEN

tcp        0      0 :::389                      :::*                        LISTEN

unix  2      [ ]         DGRAM                    19389

[root@testldap certs]# netstat -an | grep 636

tcp        0      0 0.0.0.0:636                 0.0.0.0:*                   LISTEN

tcp        0      0 :::636                      :::*                        LISTEN

unix  3      [ ]         STREAM     CONNECTED     13636

[root@testldap certs]#

Able to connect to 636 port using openssl connect

[root@localhost sandeeplade]# openssl s_client -connect 10.22.156.157:636 -showcerts -CAfile cacert.pem

CONNECTED(00000003)

write:errno=104

---

no peer certificate available

---

No client certificate CA names sent

---

SSL handshake has read 0 bytes and written 307 bytes

---

New, (NONE), Cipher is (NONE)

Secure Renegotiation IS NOT supported

Compression: NONE

Expansion: NONE

No ALPN negotiated

SSL-Session:

    Protocol  : TLSv1.2

    Cipher    : 0000

    Session-ID:

    Session-ID-ctx:

    Master-Key:

    Key-Arg   : None

    Krb5 Principal: None

    PSK identity: None

    PSK identity hint: None

    Start Time: 1516769274

    Timeout   : 300 (sec)

    Verify return code: 0 (ok)

---

[root@localhost sandeeplade]#

ldap.conf file

[root@testldap certs]# cat /etc/openldap/ldap.conf

#

# LDAP Defaults

#



# See ldap.conf(5) for details

# This file should be world readable but not world writable.



#BASE   dc=example,dc=com

#URI    ldap://ldap.example.com ldap://ldap-master.example.com:666



#SIZELIMIT      12

#TIMELIMIT      15

#DEREF          never





PORT 636

#TLS_CACERTDIR  /etc/openldap/certs

TLS_CACERTDIR /etc/openldap/certs

TLS_REQCERT allow



ssl start_tls

tls_checkpeer yes

tls_cacertfile /etc/openldap/certs/cacert.pem



[root@testldap certs]#



slapd.conf file



[root@testldap certs]# cat /etc/openldap/slapd.conf

TLSCACertificateFile    /etc/openldap/certs/cacert.pem

TLSCertificateFile      /etc/openldap/certs/server.crt

TLSCertificateKeyFile   /etc/openldap/certs/server.key



# Use the following if client authentication is required

#TLSVerifyClient        demand

# ... or not desired at all

TLSVerifyClient never



[root@testldap certs]#

certificates are available in /etc/openldap/certs and they are generated using openssl

[root@testldap certs]# cd /etc/openldap/certs/

[root@testldap certs]# ls -lrt

total 96

-r--------. 1 root root    45 Jan 23 21:59 password

-rw-r--r--. 1 root root 16384 Jan 23 21:59 secmod.db

-rw-r--r--. 1 root root 65536 Jan 23 21:59 cert8.db

-rw-r--r--. 1 root root 16384 Jan 23 21:59 key3.db

-rw-------. 1 ldap ldap  1743 Jan 23 23:57 server.key.pass

-rw-r--r--. 1 root root  1094 Jan 23 23:59 server.csr

-rw-r--r--. 1 root root  4718 Jan 24 00:02 server.crt

-rw-r--r--. 1 root root  1675 Jan 24 00:38 server.key

-rw-r--r--. 1 root root  4537 Jan 24 05:18 cacert.pem

[root@testldap certs]#

ldaps enabled in /etc/sysconfig/ldap

[root@testldap certs]# cat /etc/sysconfig/ldap

# Options of slapd (see man slapd)

#SLAPD_OPTIONS=



# At least one of SLAPD_LDAP, SLAPD_LDAPI and SLAPD_LDAPS must be set to 'yes'!

#

# Run slapd with -h "... ldap:/// ..."

#   yes/no, default: yes

SLAPD_LDAP=yes



# Run slapd with -h "... ldapi:/// ..."

#   yes/no, default: yes

SLAPD_LDAPI=yes



# Run slapd with -h "... ldaps:/// ..."

#   yes/no, default: no

SLAPD_LDAPS=yes



# Run slapd with -h "... $SLAPD_URLS ..."

# This option could be used instead of previous three ones, but:

# - it doesn't overwrite settings of $SLAPD_LDAP, $SLAPD_LDAPS and $SLAPD_LDAPI options

# - it isn't overwritten by settings of $SLAPD_LDAP, $SLAPD_LDAPS and $SLAPD_LDAPI options

# example: SLAPD_URLS="ldapi:///var/lib/ldap_root/ldapi ldapi:/// ldaps:///"

# default: empty

#SLAPD_URLS=""



# Maximum allowed time to wait for slapd shutdown on 'service ldap stop' (in seconds)

#SLAPD_SHUTDOWN_TIMEOUT=3



# Parameters to ulimit, use to change system limits for slapd

#SLAPD_ULIMIT_SETTINGS=""

[root@testldap certs]#

I am struggling to get the openldap worked from past two days. Any help is highly appreciated

Your ldpasearch parameters are wrong for an SSL query. See here: https://stackoverflow.com/questions/9468137/ldapsearch-over-ssl-tls-doesnt-work

You need to use the "-H" iso -h and -p.