It is an issue that can occur with different LDAP backends, the Zammad code mentions this for IBM, the gem docs for MSAD (s.a.) and we do in fact have an issue fixed by the no_page option with openLDAP (reproduces in our setup).
It is an issue that can occur with different LDAP backends, the Zammad code mentions this for IBM, the gem docs for MSAD (s.a.) and we do in fact have an issue fixed by the no_page option with openLDAP (reproduces in our setup).