JDBC connection problem

i'm currently trying to make an JDBC connection to Oracle DB present on an UNIX system.I have Oracle thin driver for that the driver is getting loaded but when i use the getConnection Statement I get an error as

java.sql.SQLException: Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=135290880)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))

please tell me what went wrong.please tell me the correct format of url string used in getConnection.
i'm giving as getConnection(url,"login","passwd");

in my case url=jdbc:oracle:thin:sony.utd.edu:EXP","login","passwd");
in the above statement sony.utd.edu is a unix server where oracle is loaded and database name being EXP.
is the above format correct.
i cant go ahead if i cant make an connection.

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