Sometime you are browsing the internet and trying to open any website, your e-mail and any FTP sites, you see different error codes there.
You should be familiar with these error codes.
You can solve these problems if you are well-known with the meaning of error codes.
Error Codes Meaning
Error 400 This is bad request error: First check you may be typing wrong URL name and server could not understand your request.
Error 401 You are trying to open any unauthorized access site or page: Check your username and password if you are trying to open any webpage.
Error 402 Payment Required
Error 403 You are trying to open any forbidden page and you are blocked by that domain.
Error 404 Here you are trying to open the webpage that was removed or re-named, also check the URL spelling.
Error 408 This is time out error. you should send the request with in time that the server set for you.