TCP/IP connection on PostGre 8.0

# - Connection Settings -

listen_addresses = 'localhost' # what IP interface(s) to listen on;
    # defaults to localhost, '*' = any
port = 5432
#tcpip_socket = true
max_connections = 100
 # note: increasing max_connections costs about 500 bytes of shared
 # memory per connection slot, in addition to costs from shared_buffers
 # and max_locks_per_transaction.
#superuser_reserved_connections = 2
#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777 # octal
#rendezvous_name = ''  # defaults to the computer name

# - Security & Authentication -

#authentication_timeout = 60 # 1-600, in seconds
#ssl = false
#password_encryption = true
#krb_server_keyfile = ''
#db_user_namespace = false

              =========== pg_hba.conf file

# TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD

# "local" is for Unix domain socket connections only
local   all         all                               trust
# IPv4 local connections:
host    all         all         0.0.0.0           0.0.0.0      trust
# IPv6 local connections:
host    all         all         ::1/128               trust

But when I try to connect it using pgAdmin3 tool its giving erro :

"Error Connectiong to the server : coldnnot connect to server.Connection refused . Is the Sserver running on host " ip add" and accepting TCP/IP conections on port 5432?"

the service staus is running.

And when i used  : netstat -a  . then only

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State

tcp        0      0 Portal:postgres          *:*                         LISTEN

Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node Path
unix  2      [ ACC ]     STREAM     LISTENING     10315  /tmp/.s.PGSQL.5432

So Can any body tell me whts the prob with this?? why I am not able to connect it on tcp ip port???