Small office pier to pier network, using cable (Optimum Online) and a number of sites like USPSA.com, JP enterprises, Brianenos.com, can't connect. Internet works fine, all internet explorer settings are at default level. If I log on to AOL, I can then connect to these sites. All computers (3) on network do this. Using Mcafee (only on 2), and no filters on that I know of. Linksys router. Everything used to work fine, any suggestions? I tried lowering all internet explorer settings, turned off all firewalls, same result. Installed Internet Explorer version 8 beta version, same thing. I'm stumped - anyone?