How to change priority of concurrent request in R12

Open "System Administrator" responsibility. Go to
Concurrent > Requests

How to create external tier to enable SSL and configure reverse proxy for Oracle R12

First we have created a directory named “tatrac”. This directory will be used as an external tier instance top.

After setting apps env, run this command.

SSL handshake error is coming during PO sending by xml gateway

Step 1 - Set Your Environment

1.Logon to the application middle tier as the OS user who owns the middle tier files.

2.Source your middle tier environment file (APPS.env) located in the APPL_TOP directory.

How to unregister R12 while OID is corrupted

If OID is corrupted and you want to forcefully deregister OID from R12, run the following command.
$FND_TOP/bin/txkrun.pl -script=SetSSOReg -removereferences=yes

libXtst.so.6 cannot open shared object file error during Oracle Installation

The "libXtst.so.6 cannot open shared object file" is quite common if you install any oracle product on 64bit system and misses something in the system