I have a dell laptop with Windows 7 installed. I have a ubuntu 10.10 installed on the same computer. The Internet was working fine till yesterday on both O.S. But due to the some odd reason I could not access Internet on Windows 7 but in ubuntu it is working fine. Actually, I am using ubuntu to post this message. I haven't changed the network setting and am using the same wi-fi. The troubleshooting centre gave this message "Resource (web proxy) is online but isn't responding to connection attempts. The remote computer isn't responding to connections on port 3128 , possibly due to firewall or security policy settings, or because it might be temporarily unavailable. Windows couldn't find any problems with the firewall on your computer I am using firefox on both. On both internet was working till yesterday. I am accessing a public wi-fi network which uses 10.0.0.3 and 3128 port. I am using Microsoft security essentials and no 3rd party firewall. This is the first time I have seen this error. I found things about disabling proxy but my wi-fi wouldn't work without that. What to do?