windows server 2012: 设置IP地址时 老提示已被设过 ，无法设置成功

解决办法，微软官网中找到：

Q: The IP address XXX.XXX.XXX.XXX you have entered for this network adapter is already assigned to another adapter Name of adapter.Name of adapter is hidden from the network and Dial-up Connections folder because it is not physically in the computer or is a legacy adapter that is not working. If the same address is assigned to both adapters and they become active, only one of them will use this address. This may result in incorrect system configuration. Do you want to enter a different IP address for this adapter in the list of IP addresses in the advanced dialog box?

A: 

1. Use one of the following methods to go to a command prompt:
   

• In Windows 8 or in Windows Server 2012, use the Search charm to search for cmd, and then tap or click Command Prompt.

• In earlier versions of Windows, click Start, click Run, type cmd.exe, and then press Enter.

Type set devmgr_show_nonpresent_devices=1, and then press Enter.Type Start DEVMGMT.MSC, and then press Enter.Click View, and then click Show Hidden Devices.Expand the Network Adapters tree.Right-click the dimmed network adapter, and then click Uninstall.

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经过测试， 可以正常设置