This article was previously published under Q102795
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With Windows NT, multiple network adapters in one machine must be ondifferent networks (either physically separate networks or differentlogical networks with different transport protocols). Otherwise, youwill receive the following error message:
A duplicate name exists on the network. This error prevented the network from starting.
The duplicate name exists on the network error occurs because eachadapter will attempt to register itself on the network using a NetBIOSname. When the adapters try to register their NetBIOS names on thenetwork, only the first adapter that attempts to register its NetBIOSname will succeed. The second adapter's attempt to register its namewill generate the error message above and fail to register.
Windows NT does not check for these potential conflicts when a secondnetwork adapter is installed. Windows NT simply binds all installedprotocols to the second adapter, regardless of whether they were boundto the first network adapter.
To work around this error, either manually disable the bindings orremove the conflicting protocol from the second network adapter. Thiscan be done using the Network option in Control Panel