Access error "400 Bad request": what is it, and how to fix the situation?

Who among the fans wander through the expanses of the Internet did not encounter the error in the browser "400: Bad request"? True, not all surfers know what it means and why it arises. Now we will try to clarify this situation.

400 Bad request: what does this error mean ?

As it is believed in the computer world, error number 400 is exclusively user-defined when entering an incorrect request (URL) to access a specific site on the World Wide Web. Let us disagree with this.

Of course, you can enter an incorrect address, but sometimes even with the correct address or open link, the "HTTP: 400 Bad request" error appears again and again. There can be very many reasons for this. This is especially true when accessing personal hosting, hosted on different, independent from each other servers of different providers. What is the reason?

Query syntax errors

Indeed, one of the root causes can be called a violation of the correctness of entering the address of the page. Yes, take a simple example: when trying to access the same mail server Mail.ru, a Ukrainian user can enter the URL in the address line, as if corresponding to his region (in this case, say, this is the mail.ua address).

In fact, there is no such site with the postal service in nature. It is clear that any Internet browser will immediately send out a message "400: Bad request". But even with such a statement of the question, you can find a whole bunch of reasons for the error of access.

Although it is commonly believed that in translation this English phrase means "bad (incorrect) query", there are quite a few additional factors that can cause the appearance of such messages.

Error 400: Bad request Nginx

The Nginx system itself is either a specific proxy mail server or a web server running under UNIX systems.

Typically, errors of this kind are associated with an incorrect server response for a request from a specific IP address. The results of the errors are registered in a special LOG file, after which they are automatically entered into the firewall as unreliable. Thus, hosting is disrupted, regardless of which "operating system" or browser is used in this situation.

Impact of the firewall

As you can see, the "400: Bad request" error often occurs when the request is blocked by the firewall.

An exit from such situation can become entering of an address of a site or the access device in the list of exceptions. For Windows-based systems, this is done by accessing the security menu in the standard "Control Panel".

In principle, there is nothing terrible even in disabling the firewall completely (of course, with a powerful antivirus package). On this account, too, need to give some explanation.

Antivirus exclusion list

Typically, the most common staffed anti-virus packages have their own built-in firewall. It can also block potentially unsafe or unwanted content.

In this situation, if you receive the "400: Bad request" error message, it is worth doing the same as in the case described in the previous sub-heading.

Most necessary actions

Speaking about the solution of the problem with error 400, it is worth highlighting the general principles for solving such a problem. To begin with, in the installed browser, you just need to clean the browsing history, delete the cache files and cookies. Only after this, you can apply exclusion lists.

By the way, after cleaning unnecessary garbage in the browser, it is strongly recommended to restart the computer terminal. It is likely that the problem will disappear by itself. If this does not happen, you will have to contact the provider (especially if an error occurs in all browsers). It may very well be that hosting does not work or access to certain resources is blocked precisely because of malfunctions in the operation of the provider's equipment.

In any case, at least one of the proposed solutions to the problem, when the "400: Bad request" error occurs, should help. If this does not work, especially if there are messages related to Nginx locking, you should check the system for viruses, as many of them are masked for this particular service.

In addition, it is worth to separately check the computer for the presence of ads or spyware such as Malware, Adware or Spyware specialized software. It may very well be that the unauthorized installation of some additional elements such as fast access panels and led to a disruption of the system as a whole.