Don't waste the time and resources of people not involved. The Internet gives you a great chance to put your best face forward. Be forgiving and try to help others. If you receive a 400-Bad Request, this means you entered a URL that is not accepted as correct or accurate. You will also want to check the colons and number of slashes.
Some sites only allow specific domains to access the site.
If you are sure you have access, enter the password again. If you don't have a password, or your domain does not have access to the site, you won't be able to access it. If you hit the 403-Forbidden brick wall, you might as well forget it. You are not permitted to access this document. It is password-protected, or the host does not want your domain to enter.