I cannot access some sites (www.girlscouts.org, www.fanfiction.net) through my router. Other sites (yahoo, cnn, comcast) work fine. However, if I remove the router and connect directly to the cable modem, everything works fine. I cannot think of any reason why connecting through the router would affect only certain sites. We have had the same setup for years; the problem with selected sites started yesterday. My router is a Linksys BEFSR41, with firmware 1.46.02 (Aug 3, 2004). A Linksys switch (EZXS55W) is connected to the router. The cable modem is a Terayon TJ615. Our ISP is Comcast. The network has five computers with various operating systems (W2000, XP Pro, XP Home, XP Media). All five have the same problem. I have powered everything down (and left it off at least a minute) multiple times. I have reset the router (held reset button for five seconds). I have also tried using my Vonage router (Linksys RTP300) instead of the BEFSR41, with no improvement. Does anyone have any ideas?