LDAP authentification on HA-Cluster fails

Hi Guys,

i configured LDAP on all our Firewall and it works prefect! We're using 3040B Fortis with Firmware v5.2.13,build762.

The Cluster is  Active-Passive. 

config system ha
    set group-name "fw-CUST"
    set mode a-p
    set password ENC 
    set hbdev "wan1" 50 "wan2" 25
    set session-pickup enable
    set ha-mgmt-status enable
    set ha-mgmt-interface "mgmt2"
    set ha-mgmt-interface-gateway 10.152.220.1
    set override enable
    set override-wait-time 600
    set monitor "mgmt1" "port13" "port24"

config system interface
    edit "mgmt1"
        set vdom "root"
        set ip 10.152.220.40 255.255.255.0
        set allowaccess ping https ssh snmp
        set vlanforward enable
        set type physical
        set alias "mgmt-cluster"
        set snmp-index 1
    next
    edit "mgmt2"
        set ip 10.152.220.41 255.255.255.0
        set allowaccess ping https ssh snmp
        set vlanforward enable
        set type physical
        set alias "mgmt-CUSA"
        set snmp-index 2

And now my problem, when i hit each Firewall by the common ip, , then i can log in with the LDAP User

BUT when i use the cluster IP... it fails on the Firewall! 

What can i do?

Need help! Cheers Raffa