error code 400

Question

Just starting yesterday after an update I keep getting a error code 400 the size of the request header is too long. How do I get rid of this?

Answer 1

Hi KenKizer -

I'm Kevin B. Independent Advisor and a Windows user like you. I do apologize for the inconvenience that you're experiencing right now, let me help you sort things out.

Does it show automatically after the computer boots to the desktop or does it show when you try to open any application on your computer?

Kindly follow the steps below and check if it helps.

Run a system file checker to verify the integrity of windows system files on your computer making sure that there are no corrupted files on your windows.

Perform SFC Scan and Repair Windows Image

-This process will perform scan for any corrupted system files or integrity violation and will attempt to repair it along with the Windows Image.

1. Open command prompt with administrator access
2. Type each command below and wait until scan is completed.

SFC /scannow

DISM /Online /Cleanup-Image /CheckHealth

DISM /Online /Cleanup-Image /ScanHealth

DISM /Online /Cleanup-Image /RestoreHealth

Quick note: While the command is running, it's expected to see the process stuck at 20 or 40 percent. After a few minutes, the process will complete successfully.

Once you complete the steps, the Deployment Image Servicing and Management tool will connect to the Windows Update servers to download and replace any damaged files in the local image for Windows 10 as necessary.

3. Close the command prompt.

After the scan completes, kindly disable all non-Microsoft services on your computer to make sure that they are not causing or contributing to the issue

Perform Clean Boot

• This process will eliminate 3rd party application running in the background of your computer along with services that are not needed to run windows. If there's any conflicting 3rd party application that causes the issue on your computer, this process will stop it.

1. Open the run box by pressing the Windows Key + R and type msconfig
2. System Configuration Utility box will open and by default you are on general tab.
3. On the General tab, click the selective startup and make sure that load system service and load startup items both have checked mark.
4. Click on services tab
5. Put a check mark on Hide All Microsoft Services > This is a very important part as if you miss to click on this, computer might not boot properly or permanently and will end up on clean installation.
6. Once Hide all Microsoft Services have checked mark on it, click on Disable All
7. Click on the Startup Tab and click open task manager. This will open another window which contains all your startup applications on the administrator account.
8. Disable all application that you're not using. You can simply just click on them and select disable.
9. Click OK , Apply and close the configuration utility

Restart the computer and check if the same issue appears

If the above method did not resolve the issue, kindly try to create a new user profile and check if the same issue appears. This is to check if the issue is profile specific.

To create new user profile, please follow the steps below

1. Open the Settings by pressing the Windows Key + I
2. Click on Accounts
3. In the left pane menu, click on Family & Other Users
4. Under other users, click on add someone else on this PC
5. By default, it will going to ask you to sign in using a Microsoft account, click on the link below which says I don't have this person's sign in information
6. Click on Add a user without Microsoft account
7. Fill out a username and click next until completion.

Sign out to the current user and sign in on the new user profile.

Check if everything works fine on the new user.

Hope this will help and have a bless day!

Thanks.

Kevin B.

Independent advisor