How to debug HTTP request?

A page keeps poping up on my yahoo that says bad request http 400?

This page pops up one after the other when I am on my yahoo mail pages. It just keeps poping up. I have pop up blocker on but it says I have made a bad request when I have not touched a thing. The webpage cannot be found HTTP 400 Most likely causes: There might be a typing error in the address. If you clicked on a link, it may be out of date. What you can try: Retype the address. Go back to the previous page. Go to spe.atdmt.com and look for the information you want. More information This error (HTTP 400 Bad Request) means that Internet Explorer was able to connect to the web server, but the webpage could not be found because of a problem with the address. For more information about HTTP errors, see Help. that is it!!!!
Answer:

I don't have an answer, but I wanted to put out there that I am also having this problem. So, you're not alone. I'm currently working with my tech support person at work to find out what the deal is. I'm relieved to know I'm not the only one. Maybe it's not my computer after all.

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