Has your client made an incorrect or illegal request?


400 Bad Request: Your customer has issued an incorrect or illegal request that occurs when we try to access the web page that is not available or have requested a secure page without the correct credentials. Checking the URL and using the correct credentials after clearing cookies and cache should easily fix the incorrect request error.

The inability to access a website can be due to various reasons. While errors could attribute some of these to the server side, a few could well be related to issues with the client, aka the user. And Error 400 belongs to the second half.

The accompanying error message reads Bad Request – Your customer made an incorrect or illegal request, which embodies our statement above. As a result, as long as the request leaves your PC, it cannot be transmitted by the servers.

Your customer made an incorrect or illegal request

So what could be the reason for this problem? An incorrect URL or a browser using outdated browser cache or stored DNS records are the two most common causes of the error, as mentioned above.

While the issue is undoubtedly quite worrying and irritating in equal parts, luckily there are some workarounds known to resolve this issue. And this guide will let you know.

Recheck URL format

One of the main reasons for this problem is the entry of Incorrect URLs by the user. In this regard, you should check the spelling of the website if you have mistakenly used backslashes instead of forward slashes or have embedded an unsupported symbol such as braces in the hyperlink.

In addition, although the name of the site is not case sensitive, his repertoire could be. Just check that everything is entered after the .com domain is exactly as it should be. Keep these points in mind and see if you can access the site.

Try incognito mode

It’s no hidden secret that third-party add-ons can lead to various types of 4XX errors. Therefore, the safest bet is to browse the web in private mode in Chrome. This will disable all extensions, and if that fixes the issue as well, the next action is to disable or remove any newly installed add-ons.

Here are the steps to open incognito mode in Chrome:

  1. Launch Google Chrome browser.
  2. Press the key Ctrl + Change + NOT shortcut keys to open a Private browsing window.
    Use Google Chrome Incognito
  3. Try now access the site that was causing the incorrect request error.

If it loads without any issues, the problem could most likely be attributed to the installed extensions or to the clutter of cookies and cache in the browser.

Disable browser extension

Most of the problems when accessing the browser are usually due to the extensions we have installed. Even I ran into the issue with the website not loading properly and found extensions to be the culprits. I think these browser extensions might result in malformed or illegal requests.

Here are the quick steps to turn off browser extensions in Chrome:

  1. Launch Google Chrome browser on the computer.
  2. Visit the Chrome extensions pages at chrome: // extensions / address.
  3. Toggle button to disable the extension.
    Disable browser extensions on the Chrome computer
  4. Now deactivate each of the extensions, one at a time, until the error has been corrected.

In addition, it is recommended to immediately uninstall extensions that cause an extension.

While these add-ons tend to add more functionality to the browser, sometimes they can cause some issues. As this happens, you better say goodbye to this expansion.

Clear DNS cache

DNS acts as a registry that keeps all domain names matching their IP addresses. But if this data is outdated or corrupted, the browser will not establish a successful connection to the web. Therefore, it is recommended that you delete the cached temporary data.

Here are the steps to clear the DNS cache of Windows operating system:

  1. Open the The Start menu and seek CMD.
  2. Launch the Command Prompt like a administrator.
    Run the command prompt as administrator
  3. Type now ipconfig / flushdns, and hit Enter.
    Clear DNS and IPConfig in Windows Command Prompt

This will remove the DNS cache and hopefully the bad request will rectify the problem.

Flushing the DNS may delay the loading of the website the next time you visit it. However, this is only a one-time delay and would be fixed as soon as the cache data is filled again.

Clear browser cache and cookies

Over time, a lot of temporary data in the browser is accumulated. This not only slows down the browsing experience, but can also conflict with proper loading of websites. You should therefore consider deleting these cache and cookie files as soon as possible.

Here are the steps to clear browser cache and cookies:

  1. Launch the Chrome browser.
  2. Type delete cache chrome actions in the address bar.
  3. Click on Clear browsing data from the drop-down menu.
    Clear browsing data Google Chrome actions
  4. To select Cookies and other site data and Cached images and files.
    Clear cookies and Chrome browser cache
  5. Hit on the Erase data and wait for the process to complete.

Check if this fixes the 400 Bad Request error in the browser.

Deleting cookies may erase some of the information stored. Likewise, deleting the cache would result in the browser asking for a few extra seconds before loading a site. But both should be in the right way if they fix the underlying problem.

Check file size

If you are getting this error while trying to download a file, it may be due to the maximum file size restriction placed by this site. So remember to compress this file in RAR or ZIP format before uploading it to the web. Or, if possible, upload the file to the clouds then share the link with the relevant party.

Bottom Line: Fixed 400 incorrect requests

So this was all taken from this guide on how you could fix the 400: Bad request – Your customer issued an incorrect or illegal request Mistake. We have shared five different methods for the same thing.

In my case, the DNS cache was not in sync with the online records. As a result, the browser was still retrieving old data and, in turn, could not establish a successful connection. Deleting those domain name server cache turned out to be the savior in my case.

Let us know in the comments which one made you successful. Also share if you’ve tried something that worked to resolve the issue.

Finally, here are the recommended web browsers for your computer and mobile phone that you should try.

If you have any ideas about How to fix: your customer made an incorrect or illegal request?, so feel free to drop by the comment box below. If you find this article useful, consider sharing it with your network.


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