pgadmin3 / postgresql newbie question

hi all,
running amd64 fedora core 3 w/ default postgresql
7.4.7-3. did asu - , su postgres and createdb mydb as
explained in the postgresql tutorial. installed the
latest pgadmin3 and am trying to connect to this
database. as i wasn't sure what the FC3 default
password was for postgres, i changed it to something i
could remember.

i can't seem to connect to the new database using
pgadmin3. i have the correct IP address of the local
computer, default port 5432, mydb as the initaldb,
postgres as the username, and my new password as the
password. i keep getting the error

Error connecting to the server: could not connect to
server: Connection refused
Is the server running on host "192.168.1.24" and
accepting
TCP/IP connections on port 5432?

i also verified the postgresql service is running, and
that i've added the following to
/etc/raddb/postgresql.conf:
login = "postgres"
password = "mynewpassword"

and right underneath it:
tcpip = true

i've also disabled my local firewall and SELINUX just
for kicks. and yes, i did a reboot.

so...anyone know what else i can look at?

many thanks!
jonathan