connect to database over network

Hi,

I am trying to connect to the PostgreSQL 7.3.1 database running  on RH-Linux 8. I already compiled my psql program on my Win XP. When I run the followig command:

psql -h synapse.xxx.xxx.xxx -d myDatabse -U postgres

I got the error message as below:

psql: could not connect to server: Connection reset by peer (0x00002746/10054)
        Is the server running on host synapse.xxx.xxx.xxx and accepting
        TCP/IP connections on port 5432?

The thing is that I started the postermaster with -i option and I already added my client PC's IP to the pg_hba.conf. Also, I can ping synapse.xxx.xxx.xxx without any problem. Any suggestions? Thanks.

Wei