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I install ufw, gufw & firestarter yesterday, but uninstalled them all today. Now, I find that I cannot access the server from outsite. When I could before. How can I debug whats blocking these?

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Have you port forwarded your router? – wojox May 13 '11 at 4:56
@wojox, I think that shldn't be the prob as I am able to access the server ok b4 installing firewall etc – JM at Work May 13 '11 at 5:08
up vote 3 down vote accepted

Have you tried restarting the server? Although you have uninstalled the firewalls, their rules might still be active in the running kernel. (Run sudo iptables -L to list all active rules).

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I would run:

sudo ufw status

To see if you have the ports you want available allowed.

If you don't, I would recommend running something like:

sudo ufw allow 80

to allow people to access your server on port 80, as an example.

Edit: Ah, I missed that you had uninstalled them.

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