I resolved this issue using below options:

1. Whitelist your DB host from your network team to make sure you have access to remote host
2. Install postgreSQL version 4 or above
3. Run below command:

   psql -h <REMOTE HOST> -p <REMOTE PORT> -U <DB_USER> <DB_NAME>
   

To open the port 5432 edit your /etc/postgresql/9.1/main/postgresql.conf and change

listen_addresses='localhost'

to

listen_addresses='*'

and restart your DBMS

invoke-rc.d postgresql restart

now you can connect with

$ psql -h hostname -U username -d database

if you are unable to authentify yourself, then you need to give your user access rights to your database

Edit your

/etc/postgresql/9.1/main/pg_hba.conf

and add

host all all all md5

(This is for a wide open access. For stricter control, consult the pg_hba.conf documentation and adjust according to your needs).

Hereafter you need also a reload

invoke-rc.d postgresql reload

I don't need to mention that this is a basic configuration, now you should think about modify your firewall and improve the security of your DBMS.