ERROR:

Bad Request 
Your browser sent a request that this server could not understand.

This error may appear in a large variety of circumstances, most of them related with SSL and servers configured improperly.

In this case it is about the case when all is fine about the apache, explorer is working fine, other websites are perfect in your browser, but only one domain name just refuses to show a normal page.

If this is a website designed for a client and the client encounters this issue then you have a big problem.

Usually someone will get this message if the website contains AJAX requests and for unknown reasons the browser considers that the website is doing bad things.

One option to solve it (the effect, not the cause)

In Mozilla, right click in the window with the problem and choose Page info or in Tools tab find Page info. In Page info go to Permissions tab (second tab) and click radio buttons in right of the page to Allow for: Load Images, Open pop-up windows and Set cockies (the last one is one which will give you problems). To not have to set up these things again, check default box if is not checked. Refresh the page and the problem is gone.

With Chrome in Tools, click Options and here click on Under the Hood. Here you have checked by default the first four options. You have to unchecked them. Make sure that in drop down menu on the bottom of the page is displayed Allow all cookies.  If you make refresh to page, your problem will go away.

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