This problem is caused by Internet Explorer showing “Friendly HTTP” error messages. You must disable this function to see the actual error your page is generating. To disable, do the following:
In Internet Explorer, click on the “Tools” Menu
Choose “Internet Options…..”
Click on the “Advanced” Tab
Under the Browsing category uncheck the “Show Friendly HTTP error messages” box
Click “OK”
Close your Browser then re-open a new browser and return to the page that is causing the error. You should now see the exact error your page is generating