Hi, everyone, I am having difficulty with some websites as well, particularly one that uses frames and multiple hosts for Java and Javascript, including links to 3rd party content. I have followed many of the hints, but now I am ready to attempt some serious (read that as actual) troubleshooting. To begin that process, I would like to know where to go for information regarding the /proc/sys/net/ipv4 files, how to configure them what they do, and what options there are. Can anyone provide me a link to known reliable information, or recommend some book(s)? I have looked at several books on firefox, and found them woefully lacking in technical content, oriented mostly for windows users, so a good reference for a firefox technical reference would be appreciated as well, specifically one that some of you good admin types found helpful. I prefer books rather than on line. I find that my glaucoma limits how long I can read on the computer more than via books. Thanks, Les H