JDBC connection problem on connecting to oracle on linux

Hi,
I am trying to connect to oracle database using "oracle.jdbc.driver.OracleDriver" driver.
connection url i used "jdbc

racle:thin:@IPOfOracleServer:1521:SID";
it is working fine on getting connected to oracle database installed in windows but
gives "Connection refused(DESCRIPTION=(TMP=)(VSNNUM=135294976)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))"
message on connecting to orcale 8.1.7 database installed on linux red hat 7.1.
Do i have to change the driver if so which one? or is it with some thing else to do with. Totally puzzled!!!
thanx
arun

[This message has been edited by arun boraiah (edited November 28, 2001).]
[This message has been edited by arun boraiah (edited November 28, 2001).]

Hi Arun,
By default the ports are NOT open with RedHat linux 7.1.
Using Firewall configuration tool open all the ports for communication atleast the port number "1521".
If you have KDE installed choose "System" -> "FireWall configuration" and then create a new rule to open a port for any protocol. This might work. I don't have enough information to answer in your mail to answer.
-Dhiva