Spent way too much time trying to debug this by myself. Have 2 Pentium 4 PCs, Gateway and Dell, both with XPSP2. No network, just DSL modem (Westell 6100). Dell connects to https://remote.xxxx.org without a problem. Gateway using IE6 throws a "page not found" error, as does Firefox 2.0. If I disconnect the DSL line from Gateway and connect to Dell, it connects without problems to the destination. Here's what I've done to Gateway PC: virus check; spybot and AdAware check; stripped registry of all appearances of https://remote.xxxx.org; recorded that URL as a Trusted site; deleted all temporary I'net files, cookies, history; emptied Recycle Bin; added the site's IP address to all "Host" files; checked every single Internet Options dialog box item, ensuring selections between the 2 PCs were identical; ran ipconfig /all -- no errors; turned off Zone Alarm (Windows firewall was already Off); uninstalled Zone Alarm; turned off AVG antivirus. Result -- nada. What am I overlooking?