problema conexion desde pyhton y oracle

Submitted by olmer (not verified) on 27 December, 2007 - 19:49.

desde python me intento conectar a Oracle de manera remota con la cadena de conexion conexion=cx_Oracle.connect("usuario/contraseña@host") y me sale el siguiente error ORA-12514 el listener no ha podido resolver el SERVICE_NAME del descriptor de conexion espero pronta respuesta a la posible solucion

gracias

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