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The problem I'm having is randomly users are receiving blank pages. It happened to me once, I viewed source and there was nothing (Firefox).
I receive emails from LogWatch, and in it is: "Dropped 39942 packets on interface eth1". I've noticed that the IPs of the people getting blank pages are usually in there (the ones that aren't could have been another day then the log I was viewing).
I am running REDHAT Enterprise 4 with WHM/cPanel. I am running Apache 1.3, PHP5, MySQL5. All up to date.
Server is dual 2.6 dual core processors, 2GB ram, and 100Mbps link.
Reviewing the logs I believe the firewall was thinking the users were a P2P program and blocking them. All the drops on port 80 were logged as *** P2P ***. Viewing the source of the firewall script, it was definitely coming from there. WHY it was blocking it from port 80 I don't know, as that wasn't on the list of ports to block..