Configuring Oracle for JDBC

I am trying to set up a Linux (I am using Fedora Core 4) server with
Oracle 10g on it but can't seem to be able to connect to it using
JDBC. I don't know how to get my machine to respond to a specific
name, but can ssh into it from within my own network by using:

ssh jmecc@192.168.0.110

so I am trying the same with my JDBC connection string:

"jdbcracle:thin:@192.168.0.110:1521:test"

I modified the listener.ora file to

LISTENER =
(DESCRIPTION_LIST=
(ADDRESS=(PROTOCOL=tcp)(HOST=jbox.jdomain)(PORT=15 21))
(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)
)
)
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(SID_NAME=test)
(ORACLE_HOME=/u01/app/oracle/product/10.2.0/db_1)
(PROGRAM=extproc)
)
)


and started this service using lsnrctl. I still get a "The Network
Adapter could not establish the connection" error though.

The problem may be in the DB setup though, as I can't login even using
sqlplus from accounts that are not part of the 'oinstall' &
'dbus' groups. The 'oinstall' group gives too many permissions, so I
shouldn't give this out to other users and anyway I don't know if
a JDBC connection even assumes any particular user profile.

Any input would be appreciated.
Thanks,
Jo