OpenLdap authentification failure

We successfully created an OpenLdap infrastructure under Enterprise RG Linux vers 7.4 and we are able to authenticate from other Linux systems.

However, when we try to authenticate from a Brocade SAN switch, the authentification fails with the message:

conn=42005429 op=1 do_bind: invalid dn (found in OpenLdap log)

Brocade/Broadcom support said that our Switch configuration is correct.

Any idea ?