NLB Cluster %2 %1: Duplicate cluster subnets detected. The network may have been inadvertently partitioned. %3 %4

Details
Product: Windows Operating System
Event ID: 18
Source: WLBS
Version: 5.2
Symbolic Name: MSG_WARN_OVERLAP
Message: NLB Cluster %2 %1: Duplicate cluster subnets detected. The network may have been inadvertently partitioned. %3 %4
   
Explanation

The hosts in this cluster formed two or more separate clusters. This is usually caused by network partitioning that prevents the Network Load Balancing (NLB) heartbeats of one or more hosts from reaching all of the other hosts in the cluster. This event is logged when the network problem is corrected and the hosts converge back into a single cluster.

   
User Action

Investigate the cause of the network partitioning. No investigation of NLB is necessary.

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