The ldapsearch reports "unsupported extended operation" error

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Issue

Running any LDAP query with ldapsearch reports:

# ldapsearch -x -ZZ -h myipa.example.com -b "dc=example,dc=com" uid=username
ldap_start_tls: Protocol error (2)
        additional info: unsupported extended operation

Environment

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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