Starting ProgreSQL server

I've followed the installation instructions for 7.4.3 on Fedora Core 1 Linux on a Pentium II 233 system, and it's
installedfine. I've instructed the configure tool to use TCP port 5321 during the installation. 
 
I tried to create a test database with createdb, and this is the message I get:
 
createdb: could not connect to database template1: could not connect to server: Connection refused
        Is the server running on host <IP address> and accepting
       TCP/IP connections on port 5321? 
I've got PGHOSTADDR set to <IP address>, which is the correct address for my Linux machine, and PGPORT set
to5321, and the PostgreSQL server is set to start with the -i switch. 
 
I can't think of anything else that it could be - I had it working before without specifying a port during the
configurationphase, but I need the database running to test a customer's application, which is expecting the server to
belistening to a specific port. 
 
I haven't found anything else useful in the documentation other than setting PGHOSTADDR and PGPORT in the
environment,but can anyone else come up with something I can check? 
 
Thanks in advance,
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