PHP 5.2.17 and Oracle 8i

Hi there,
I encountered a problem that I have spent hours fixing that. Here is the problem:
I am trying to connect to a remote Oracle 8i server using Oracle 11g client: here is my connection string in PHP:
$conn = oci_connect('db_user', 'db_pass', "db_ip");
db_host is the ip of the server, such as "12.34.56.78".
The error shown is "*ORA-12514: TNS:listener does not currently know of service requested in connect descriptor*"
I could use the same client to connect to another oracle 10g server. The php code is same, only change the db_user or db_pass or db_ip.
I dont use tnsnames.ora for either oracle 10g server or oracle 8i server. I just use the simple IP of server. Does this matter?
Server using: Windows Server 2008 R2
PHP: php 5.2.17
Oracle Instant Client: 11_2
Any ideas will be appreciated.
Best,
Sam

You cannot use a 11g client to connect to an 8i database.
See this MOS Doc for a listing of client versions you can use to connect to an 8i database
Client / Server / Interoperability Support Matrix For Different Oracle Versions [ID 207303.1]
HTH
Srini

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