HI I have a Linux based fire wall ( iptables) that allow access to client on the Internet, I have current allowed all ports open both incoming and out going . I can access all site and all ports accept the site http://manage.resellerclub.com/reseller or http://manage.answerable.com/kb ( which i currently really important site for a dept in my company ) . i have no error logs to work with ... no logs what so ever .... except it give me page cannot be displayed on the browser. I had squid configured on my sever but have current stoped it . This problem has occurred since yesterday i flushed the cache ( # > /var/spool/squid/swap.state) but i don't think that should be a problem since i stoped squid !! .

How do i go about troubleshooting this issue ??

Thanks