We have a site that the client can no longer log into. IE7/8 says 'Internet Explorer cannot display the webpage' and Firefox says something similar. However, I have tried from multiple machines at my office and on my iPhone (3G connection, not Wifi) and can log into the site fine.
Is there some kind of browser or network setting that would prevent this from working? I tried setting IE security to very high (do not accept cookies), but I could log in even after that.
I cannot seem to reproduce this issue and wondering if I am missing something simple.