• The site could be temporarily unavailable or too busy. Try again in a few moments.
• If you are unable to load any addresses, check the computer's network connection.
• If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web."

http://wiki.mozilla.org/Firefox:1.5_Network_Error_Messages

Sometimes cleaning cookies helps.

tomron-- No I dont have this issue with IE7....thats why its posted as a Firefox question:) Anyway, you said you "tried ad.yieldmanager.com w/Firefox and it connected"...well, I wasnt aware that this was an actual website, if thats what youre referring to. I tried it and it didnt connect. But the other options in that frame where I get this message, like you mentioned, about the firewall, or the network connection---all of those are fine. So I dont see what could be causing it. I do clear cookies all the time. But I was thinking that at one time I may have right-clicked on an image/ad in Yahoo email, to block images from ad.yieldmanager. If that were the case, wouldnt I be able to UNblock them now? The option to do that isnt there. --Thanks for the feedback;)

Im not sure if you understand exactly what Im asking. Im not having a problem with spyware or anything, if thats why you were mentioning the google hits. I checked that out, and it had info on people who were trying to get rid of ad.yieldmanager. I never actually found this during a spyware scan. Im wondering why the images wont load where they should, instead of getting the message that "Firefox cannot establish connection w/ad.yieldmanager". I would rather just have the images load and not get that message. But why is it that, when I try to put that web address in, it says it cannot connect with that site? Thats why I was questioning before if it was an actual site, and not just some address like you see, for a tracking cookie, or similar...you know what I mean? Anyway, I just wanted to make it clear, so that theres no confusion as to what the issue is. But I do appreciate any help you can offer, thanks:)-----M.

Thanks for that information. I just might download the AVG, thats one I havent tried yet. Ive never heard of the other one you mentioned. Im not sure if its connected to spyware, but its weird that just the images from ad.yieldmanager dont load. But like you said, maybe it IS related to spyware, and if so,then hopefully it can be detected. ---Thanks again for the feedback:)