I Just installed openldap server on Solaris OS called 'ldap-master.example.com', it works fine, ldapsearch returns all ldap information on Server.

Installed openldap client on another CentOS called 'ldapclient1', configured it with most basic configuration, with ssl/tls etc. but ldapsearch returns error:
[root@ldapclient1 ~]# ldapsearch -x -b "dc=example,dc=com"
ldap_bind: Can't contact LDAP server (-1)

ldap-master.example.com is pingable:
[root@ldapclient1 ~]# ping ldap-master.example.com
PING ldap-master.example.com (192.168.50.254) 56(84) bytes of data.
64 bytes from ldap-master.example.com (192.168.50.254): icmp_seq=1 ttl=64 time=2.66 ms

Hi and welcome to LQ,

Since the ldap server is not local, you need to specify it using either the -h or -H switch. I.e:
Alternatively, you can use /etc/ldap.conf on the client to specify the ldap server and other details.

Regards