I'm not sure if this is a Windows issue or a SQL Server in a cluster issue,
but it's strange.

We have a Windows 2003 Server Enterprise w/SP2 Running in a cluster.  The
only thing on these servers is SQL Server.  It's behind a firewall with only
the SQL ports open.

The problem we are running into is that from time to time, the primary node
in the SQL Cluster become unresponsive to the public NIC and the heartbeat
NIC and it doesn't failover.  You can't RDP to it and the Cluster
administrator doesn't pick it up.  You can't even ping the primary or
heartbeat from the passive node.  It's like it is just not there.

There is a monitor NIC on this server as well, and they are throwing NO
alarms.

After about 20 minutes, it comes back.

Should this go to the Cluster group?  Any suggestions?