[Zope] error adding ST LDAP Manager object

hi, we are using LDAP User Folder connecting to openldap; adding an ST LDAP Manager instance fails with Error type: BIND_FAILURE Error value: Description: Failed to perform an anonymous bind to the LDAP server. Source: ldap.PROTOCOL_ERROR args: ({'desc': 'Protocol error', 'info': 'requested protocol version not allowed'},) To me it looks like an authentication prob; however, there´s no option to pass any credentials; Ithought ST LDAP Manager would use the LDAP User Folder´s acquired credentials. Any ideas? Thank you, Oliver