oracle DB not connecting

[TRP prasad]

i did so many JDBC eg on my machine till now with same JDBC driver class name and JDBC url now the problem it is not connecting to the db now.
upto driver registered is executing correctly .
while executing am getting :
Exception in thread "main" java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:180)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:335)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:361)

at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va:442)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:321)
at java.sql.DriverManager.getConnection(DriverManager.java:525)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at App.main(App.java:11)

[Scott Selikoff]

TRP prasad,
Welcome to JavaRanch!

We're pleased to have you here with us in the JDBC forum, but there are a few rules that need to be followed, and one is that proper names are required. Please take a look at the JavaRanch Naming Policy and adjust your display name to match it.

In particular, your display name must be a first and a last name separated by a space character, and must not be obviously fictitious.

-Scott
JavaRanch Staff
[ September 25, 2006: Message edited by: Scott Selikoff ]

[TRP prasad]

now the problem is cleared
might be norton internet security is un installed,after un installing am getting