(Answer) (Category) OpenLDAP Faq-O-Matic : (Category) OpenLDAP Software FAQ : (Category) Configuration : (Category) SLAPD Configuration : (Answer) How to configure slapd(8) with LDAPv2 support (for legacy clients)?
OpenLDAP Software does not support LDAPv2 (now historic). OpenLDAP 2.x's slapd(8) can be configured to accept a version 2 LDAP Bind request, but expects requesting version 2 to speak a restricted, non-standard variant for LDAPv3 (basically LDAPv3 syntaxes and semantics in LDAPv2 PDUs). To enable this, place the following in your slapd.conf(5) file. 
allow bind_v2
This feature is only provided in order to support broken applications which request version 2 and then use LDAPv3 syntax and semantics in LDAPv2 PDUs.

This feature may be used to provided limited support for legacy clients using the U-Mich LDAP variant of LDAPv2, sometimes referred to LDAPv2+, and possibly other variants of LDAPv2.

Use LDAPv3 instead!

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