HELP:PHP 4.0.0 ,ORACLE 8.1.6 AND RED HUT 6.2

Hello People: is the first time that I write to this group of the news . I am truely desperate since I have an error with php 4,0,0 and oracle 8.1.6. I hope that somebody can help me since I have that to finish a project as rapidly as possible: we had a aplication with the next product: mSQL Linux 6.2 Apache 1.3.12 perl This application we passed it with some problems to php 4,0,0, well now we must change the data base by Oracle. We have installed Oracle 1.8.6. and it works, we installed php for oracle and I believe that the problem is this, the test works perfectly. When trying to execute the following function: function conexion_servidor ($user,$passw,$base) { $sock =ocilogon($user,$passw,$base); echo "se ha conectado al servidor con php con $sock"; if ($sock <0) { mensaje("Error al conectarse al servidor de Base de Datos: OCIError()"); exit(0); } return ($sock); } When i execute this function say: -Warning: _oci_open_server: Error while trying to retrieve text for error -ORA-12545 in base_datos_ora.inc on line 42. Again that I have proven it salia error ORA-12546. I believe that the error leaves so that the Web server cannot connect itself with oracle, the solution that I have proven is that the user of the server is oracle and has not given result.Ya either not that to do. I need hepl Thank Lourdes