Unexpected data in PDU

[tsg <tsg@bugalux.com>]

Hi!
Today I installed my perl script which helps me to control LDAP server to 
another computer and I was surprised to get message "Unexpected data in PDU" 
in client side and 

Jun 18 13:51:26 ldap slapd[7706]: daemon: read activity on 10
Jun 18 13:51:26 ldap slapd[7706]: connection_get(10)
Jun 18 13:51:27 ldap slapd[7706]: connection_get(10): got connid=2
Jun 18 13:51:27 ldap slapd[7706]: connection_read(10): checking for input on 
id=2
Jun 18 13:51:27 ldap slapd[7706]: do_bind
Jun 18 13:51:27 ldap slapd[7706]: <= get_ctrls: n=0 rc=-2 err=unexpected data 
in PDU
Jun 18 13:51:27 ldap slapd[7706]: send_ldap_disconnect 2:unexpected data in 
PDU
Jun 18 13:51:27 ldap slapd[7706]: send_ldap_response: msgid=0 tag=120 err=2
Jun 18 13:51:27 ldap slapd[7706]: conn=2 op=1 DISCONNECT tag=120 err=2 
text=unexpected data in PDU
Jun 18 13:51:27 ldap slapd[7706]: do_bind: get_ctrls failed

on server side.

OS: RH9 with kernel 2.4.21
>From othe computer script works well wkth the same LDAP server.
Could You please poin me how to find solution
Sergios