I am behind a http squid proxy (172.17.254.8 on port 3128). I have typed in the address and port as well as given the correct user ID and password. However, whenever I do a search i get an:
Error connecting to Server:
I can open my web browser and get to the URLs fine so they're not being blocked by the proxy.
Edit: Just had a look at what happening using Wireshark -- Seems like the HTTP requests are being sent to the correct proxy address. The proxy then asks for authentication but doesn't seem to get it.
Since the password/login are not sent in clear text (understandably) its hard to verify that they aren't being sent. I just assume they are not given that the response to the second http request (the one that should be after authentication) also gets a 407 Proxy Authentication required error.
After looking at my HTTP implementation it seems that your proxy does not return status code 407 ("Proxy Authentication Required") although this is required according to the HTTP/1.1 RFC.
Im pretty sure the proxy sends the 407 message. Its just that mp3tag doesn't reply with the correct authentication information. When I get home I will save the wireshark captures and post them.
I changed the network connection order in Vista to make my Local area connection that was connected to the Internet the first (Network and Sharing Center --> Manage Network Connections --> Advanced --> Advanced Settings)