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Event ID: 20 Source: WLBS

WLBS : port rules with duplicate single host priority <number> detected on the network. Please check WLBS Setup dialog on all hosts that belong to the cluster and make sure that they do not contain single host rules with duplicate priorities for the same port range.
As per Microsoft: "When you configure a port rule as a single host, traffic to the port or ports governed by that port rule is handled exclusively by the host whose priority has the lowest numeric value. This event is logged when the local host's single host priority is identical to the single host priority of another host". See MSW2KDB for additional information about this event.

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