Often you can fix the problem yourself by "forcing" a new DNS cache to be built on your local machines. The following setps are ones I have to use often through my work and at home - give them a try: In IE (or Firefox) - clear your temporary Internet files IE: - Click on Tools>Internet Options - Click Delete Files button in the middle of General tab under Browser History (IE 7 or higher - under Browsing History the Delete button), - Click Delete Temporary Internet Files then OK (IE 7 or higher - Check Temporary Internet Files and click Delete button at bottom) - Once finished, click OK to close Internet Options, then close all open IE sessions Firefox: - Click Options>Advanced>Network Tab - Click Clear Now button under Offline Storage - Once finished, click OK to close Options,close all open Firefox sessions Next - open a Command Prompt (under Start>Run in XP or earlier, otherwise, in Vista or Win 7, hit Windows Key+R on your keyboard if you have the default Admin Account or type CMD in the Search Programs or Files line, right-click on the CMD.exe icon and click Run with Administrator Rights) - On the Command Line, type ipconfig /flushdns - Hit Enter (should get response Successfully flushed the DNS resolver cache) Let me know if this resolved on your PC. If so, try these steps on each one impacted.