I have added some servers successfully But I have a problem adding one particular server. The error message I get is this

TITLE: Microsoft SQL Server Management Studio

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"The linked server has been created but failed a connection test. Do you want to keep the linked server?"

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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SQL Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF].

OLE DB provider "SQLNCLI" for linked server "FTWP1IEBVWV01\BILLING" returned message "Login timeout expired".

OLE DB provider "SQLNCLI" for linked server "FTWP1IEBVWV01\BILLING" returned message "An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.". (Microsoft SQL Server, Error: 65535)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=09.00.4035&EvtSrc=MSSQLServer&EvtID=65535&LinkId=20476

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BUTTONS:

&Yes

&No

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Any Ideas what might be causig this?