can't connect to remote postgresql database

You have to configure the following two files

pg_hba.conf

host all all 0.0.0.0/0 md5

postgresql.conf

listen_addresses='*'

You have to check if the port 5432 is open: http://www.yougetsignal.com/tools/open-ports/

If it's not then add a rule to your iptables:

iptables -A INPUT -s 0/0 -p tcp --dport 5432 -j ACCEPT

0/0: If you want anybody to access it. You can change it to a specific IP address or range of IP addresses.

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