Have you updated your NIC drivers?

Regards,
John

Clusters with more than two nodes use multi-cast messages to send
cluster-wide communications.  Some switches have problems with multi-cast.
Then there is the issue of multi-cast addressing.  You can tell there is an
issue when you get an error message mentioning the absence of a MADCAP
server.  MADCAP is to multi-cast what DHCP is to single-cast IP.   Read up
on multicast IP messaging and you will likely find how to tune your network
switches to avoid this problem.

Hi Geoff,

Thank you so much for your prompt attention.  This question was sent to you
on my behalf by one of my co-workers.  Thank you so much.  Have a great day.

You may want to first verify that the Heartbeat Adapter is set at the top of
the intracluster communications list.  It looks like the server is sending
heartbeats across the public network.

Shane

I need some help on how to correct getting Event ID 1123 and Event ID 1122 on one of two cluster nodes every hour or some times frequently. Two times a not main node was removed from active cluster membership(Event ID 1135). This is a two node cluster running Windows Server 2003 EE SP1 (NovaScale 3045 Itanium2 )

In the event viewer every hour on one of two cluster nodes I receive such Warnings(one after another):
a)Event ID – 1123. The node lost communication with cluster node 'Cluster0' on network 'Heartbeat Cluster Connection'.
b) Event ID – 1123. The node lost communication with cluster node ' Cluster0' on network 'Public Network Connection'.

Or the other way

a) Event ID – 1123. The node lost communication with cluster node ' Cluster0' on network 'Public Network Connection'.
b)Event ID – 1123. The node lost communication with cluster node 'Cluster0' on network 'Heartbeat Cluster Connection'.

I have already read such articles:
•    Recommended private "Heartbeat" configuration on a cluster server - http://support.microsoft.com/?id=258750
•    Multicast support enabled for the cluster heartbeat http://support.microsoft.com/default.aspx?scid=kb;EN-US;307962

I have replaced Heartbeat connection on another pair of NIC‘s but still have same problem.

Settings of my Connections

The Heartbeat connection:
a)    not using team adapter.
b)    Internal cluster communication only (private only)
c)    Cluster properties->Network priority:  set on upper level
d)    Network Connection->Advanced->Advanced Settings->Connections: not on upper level, after Private connection  
The Public connection:
a)    Using team adapter.
b)    All comunications (mixed network)
c)    Cluster properties->Network priority:  after Heartbeat (not on upper level)
d)    Network Connection->Advanced->Advanced Settings->Connections: set on upper level

May bee problem is in Heartbeat connection, or with node(which was removed from active cluster membership two times ) something wrong?

When I want to see Multicast configuration I type in CMD:  cluster „ClusterName“ network „NetworkName“ /priv
And then I see empty columns - /T/Network/Name/Value/.  Changing names of cluster and connection in command I have the same result. What does it means? The multicasting is enable or disable? And how to see corect Multicast settings?
I can disable multicasting  (but there is important data and I afraid to lost it!) This is a correct way, or what shall I do?

May bee you can help me to eliminate this problem? Any suggestions?

From http://www.developmentnow.com/g/99_2006_2_0_0_698577/The-node-lost-communication
-with-cluster.ht

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