Ensure that the Oracle database listener is running and that it allows connections to your database. To check if the listener is running, type:
lsnrctl status… after setting your environment properly so that you are using the proper $ORACLE_HOME. If the database resides on a Windows server, you can open up the Service panel and see whether the listener service is running (it will be called something similar to OracleOraHome92TNSListener). If the listener is not running, it can be started as follows (assuming a default listener with no name):
Remember to set your environment to the proper $ORACLE_HOME first.
Test connectivity to your database by starting SQL*Plus from the desktop and providing the relevant information to connect. If connecting to the database with SQL*Plus is successful, but you are still having problems connecting via Forms, you may have to turn on SQL Net tracing to resolve the problem.
Dig Deeper on Oracle database installation, upgrades and patches
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