I have a weird problem. Certain users can not access yahoo.com or sometimes google.com using Firefox or IE. On the affected laptop I can ping,traceroute,and nslookup to yahoo server without issues. I can log into the Windows domain controller server and pull up yahoo without problems. A certain user is having trouble sending email to yahoo using Outlook. DNS is properly resolving host names as far as I can tell. I tried bypassing the local DNS server and using an external server on the client machine without help. I also tried restarting the switch and Cisco ASA 5510 without avail. I am going to use wireshark on the affected PC(s) to see if they are routing traffic and also capture traffic on the ASA. Is their something that I am missing? Any suggestions on how I should go about this problem?