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By locking an interface, you can disable access to all services associated with a particular virtual domain. You can re-enable all services by simply unlocking it. When you lock a particular virtual domain, the system will stop responding to the IP address associated with it. This feature might be useful if, for example, you are an ISP and the customer for which you are maintaining the virtual domain stops paying its bill, or if you are trying to resolve possible IP address conflicts with other systems on your network. When a virtual domain is ``LOCKED'', that word replaces ``virtual'' in the ``Type'' column. (Since only virtual domains can be locked, either ``virtual'' or ``LOCKED'' in the ``Type'' column identifies a virtual domain.