Cannot Access Remote Server

I have a remote server running postgresql (9.0.4).  I have been able
to use the dbms via ssh and via phppgadmin.

Now I would like to use pgadminIII but I cannot get the server
connection.  I am running the Ubuntu version og pgadmin (1.10.5).

I have this setting in my postgresql.conf:
 listen_addresses = '*'

And these in my pg_hba.conf:

local   all             all                                     md5
host    all             all             127.0.0.1/32            md5
host    all             all             ::1/128                 md5
host  all             admin        xxx.xxx.xxx.xxx/32         md5
host  all             postgres     xxx.xxx.xxx.xxx/32         md5

where xxx.xxx.xxx.xxx is the external IP of my home network.

I can ping my server fine.

I appreciate any ideas.

Best regards,

-Tom
Niceville, Florida, USA