Hosts binding lost - every 10 minutes

In my new dss7 setup i will configure iscsi active-active failover.
I setup two node as descriped up to the point of volume replication, each node has one as source.

The nodes are directly connected within an own subnet and eth-cards.

On node a I will get the same error every 10 minutes:
2013/05/23 13:10:02 Hosts binding: Connection to host ''node-b-34961916'' lost. Please check communication route between local computer and host ''node-b-34961916''.
2013/05/23 13:00:02 Hosts binding: Connection to host ''node-b-34961916'' lost. Please check communication route between local computer and host ''node-b-34961916''.
2013/05/23 12:50:02 Hosts binding: Connection to host ''node-b-34961916'' lost. Please check communication route between local computer and host ''node-b-34961916''.
2013/05/23 12:40:02 Hosts binding: Connection to host ''node-b-34961916'' lost. Please check communication route between local computer and host ''node-b-34961916''.
...
2013/05/22 16:30:01 Hosts binding: Connection to host ''node-b-34961916'' lost. Please check communication route between local computer and host ''node-b-34961916
2013/05/22 16:22:09 Volume Replication: Device lv0001: Connection (from StandAlone to Connected). Mode local/remote (from Primary/Unknown to Primary/Secondary). DataStatus local/remote (from Consistent/Outdated to Consistent/Consistent). Device lv0000: Connection (from StandAlone to Connected). Mode local/remote (from Primary/Unknown to Primary/Secondary). DataStatus local/remote (from Consistent/Outdated to Consistent/Consistent).
2013/05/22 16:21:42 Hosts binding: Host ''node-b-34961916'' is connected.

Node b doesn't report anything.
The replikation status of both volumes are always synced.

Reboot didn't change anything.

On node b I got two cryptical messages direct after boot and before the messeges on node a begun:
2013/05/22 16:24:02 [ 14.960831] Disabling IRQ #16
2013/05/22 16:24:02 [ 7.860784] Disabling IRQ #16

Since today I cannot control node a, because trial message is updatading anf refreshing the website every 3 sec :(.

I am not very satisfied.

It may not be so much the DSS side as it is providing a message about the connectivity between the 2, can you verify if this is a didicated NIC for the Volume Replication and maybe go to the Console Screen and enter CTRL ALT N then select the NIC then go to INFO and see if there are any bad packets. What are there IP/Subnets what are the NICs - 10GbE?