Strange behavior on srx345 in cluster mode.

Hi guys,

i have a strange behavior on two brand new srx345. In cluster mode, i can't ping the reth0 interface from the outside. Let's get the point first, the reth0 interface is already set up in a security zone.The truly strange behavior is, if i rename the interface to reth1 it will run as expected. No firewall filters are used...

Any ideas?

Here is my config:

chassis {
    alarm {
        ethernet {
            link-down ignore;
        }
    }
    cluster {
        control-link-recovery;
        reth-count 3;
        network-management {
            cluster-master;
        }
        redundancy-group 0 {
            node 0 priority 100;
            node 1 priority 1;
        }
        redundancy-group 1 {
            node 0 priority 100;
            node 1 priority 1;
            preempt;
            gratuitous-arp-count 4;
        }
    }
}
security {
    zones {
        security-zone trust {
            host-inbound-traffic {
                system-services {
                    all;
                }
            }
            interfaces {
                reth1.0;
            }
        }
        security-zone test {
            host-inbound-traffic {
                system-services {
                    ping;
                }
            }
            interfaces {
                reth2.0;
            }
        }
        security-zone untrust {
            host-inbound-traffic {
                system-services {
                    ping;
                }
            }
            interfaces {
                reth0.0;
            }
        }
    }
}


interfaces {
    ge-0/0/0 {
        gigether-options {
            redundant-parent reth0;
        }
    }
    ge-0/0/5 {
        gigether-options {
            redundant-parent reth2;
        }
    }
    ge-0/0/7 {
        gigether-options {
            redundant-parent reth1;
        }
    }
    ge-5/0/0 {
        gigether-options {
            redundant-parent reth0;
        }
    }
    ge-5/0/5 {
        gigether-options {
            redundant-parent reth2;
        }
    }
    ge-5/0/7 {
        gigether-options {
            redundant-parent reth1;
        }
    }
    fab0 {
        fabric-options {
            member-interfaces {
                ge-0/0/2;
            }
        }
    }
    fab1 {
        fabric-options {
            member-interfaces {
                ge-5/0/2;
            }
        }
    }
    reth0 {
        redundant-ether-options {
            redundancy-group 1;
        }
        unit 0 {
            family inet {
                address 212.88.155.77/24;
            }
        }
    }
    reth1 {
        redundant-ether-options {
            redundancy-group 1;
        }
        unit 0 {
            family inet {
                address 212.88.155.76/24;
            }
        }
    }
    reth2 {
        redundant-ether-options {
            redundancy-group 1;
        }
        unit 0 {
            family inet {
                address 212.88.155.78/24;
            }
        }
    }
    st0 {
        unit 0 {
            family inet {
                address 10.0.4.1/28;
            }
        }
    }
}