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If you changed the default policy on any chain other than filter table chain's, this won't be enough.
There is 1 alternative - vote for the best!
This turns your iptables packet filter to a "Allow any from any to any" filter, so you can rule out any filtering issues when you have a problem to enable a connection from or to your host.
To re-enable it, run /etc/init.d/iptables restart
If you can do better, submit your command here.
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