Configurar ODBC Plesk

tentei de diversas maneiras fazer a conexao do meu banco de dados mas tá dando esse erro:

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)

Diz que ocorreu um erro enquanto estabelecia a conexão com o servidor. o resto do erro n entendi mto bem...