>Hi,
>
>I have an application in VFP9 that access SQL Server 2005 data base. When I update the server OS to Windows Vista the applicate return this message when try to connect to data base.
>
>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. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)
>

Start SQL Surface Area Configuration Configuration and Enable remote connection.
Also make sure that both protocols are enabled TCP/IP and Named pipes (SQL Server Configuration Manager).
These protocols should be enabled on each client computer also.