Microsoft NLB and after vMotion network connections

We have several hosts ESXi (4.0) one of them containing a virtual member of a NETWORK 8 Server Load Balancing cluster.

When I migrate all servers to host containing the Member of NLB cluster virtual that I can no longer connect to one of the other 7 members. But the strange thing is I can reach any other machine on this host as well as not been transferred there recently (I don't know what triggers it)

The migrated machine can reach any other machine not in the NLB cluster.

The cluster is located in multicast. and is in the same subnet as the other servers.

http://KB.VMware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalID=1006525

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