SharePoint HTTP 400 Bad Request Error

SharePoint and HTTP 400 Bad Request Error

V: 1.0

Scenario

Users go to SharePoint site and get HTTP 400 Error. They may be able to see partial page but in most cases will get the error on all the sites.

SP2010_HTTP400_BadRequest_Error

 

The error is consistent between Internet Explorer and Chrome browsers. Go to Internet Explorer Tool > Internet Options > Advanced tab and uncheck the option ‘Show friendly HTTP error messages‘. Click OK.

SP2010_HTTP400_BadRequest_Error_IEUncheckOption

Internet Explorer HTTP Error messages option

 

Then refresh the page and you will see the error details.

HTTP 400 – Bad Request (Request Header Too Long)

 

Cause

The issue can happen if a user is part of too many Active Directory groups. Too many groups can increase the Kerberos authentication token size.  The HTTP request sent to IIS web server will be rejected by IIS and users get this error.

SP2010_HTTP400_BadRequest_TooManyADGrps

Active Directory Users and Computer Management – User Account Properties

 

Note: Active Directory uses Kerberos protocol.

 

Resolution

There are two options. Either remove extra AD groups from the user’s AD account or configure the registry settings on IIS (Internet Information Server) web servers.

Registry loaction on IIS web servers:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters

Set values for MaxFieldLength and MaxRequestBytes registry keys.

Name Value Type Value Data
MaxFieldLength DWORD 65534
MaxRequestBytes DWORD 16777216

 

Registry file contents. Save below as .reg file and run on servers.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\HTTP\Parameters]
“MaxFieldLength”=dword:00065534
“MaxRequestBytes”=dword:16777216

 

Click here to Download registry file

 

After theses settings, restart your servers. In case of SharePoint, I recommend to apply this setting on all WFE and App servers in the farm.

 

References:

  1. “HTTP 400 – Bad Request (Request Header too long)” error in Internet Information Services (IIS)
  2. Problems with Kerberos authentication when a user belongs to many groups

Keywords:

  • HTTP 400 error in SharePoint
  • HTTP 400 on sharepoint page and site
  • SharePoint Bad Request error

 

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