Error Message:

Cluster Network Name resource 'name' cannot be brought online because the name name is already present on the network. Please check your network configuration.

Explanation:

This often happens when duplicating a system.

User Action:

You can do any of the following: 1) Verify that the network name is unique. 2) Turn off or rename the computer that is defending its name. 3) Create a new name for the Network Name resource you're trying to bring online.