HTTP Error 400 : The request verb is invalid in IIS 8.5

asp.nethttpverbsiis

I have hosted ASP NET 4.5 application in Windows Server 2012 R2 (IIS Version 8.5.9600.16384). But once in a while I am getting an error like Bad Request – Invalid Verb HTTP Error 400. The request verb is invalid while going from one page to another. There is no special sequence or specific page where I am getting this error.

httperr log file shows me an error like

2015-01-21 04:48:18 MyIP 55452 ServerIP 80 - - - 400 - Verb -
2015-01-21 04:48:20 MYIP 55454 SerevrIP 80 - - - 400 - Verb -

I checked this post http://support.microsoft.com/kb/828726 but here it is applicable for Microsoft Internet Information Services (IIS) 6.0. Can I do this hotfix for iis 8.5 as well. I have searched about this issue over the internet but could not get substantial information. So, can anyone help me resolve this issue.

Using Fiddler I got the Raw Data of the request as

POST http://example.com/Project.aspx?prj=5566 HTTP/1.1
Host: example.com
Connection: keep-alive
Content-Length: 30634
Cache-Control: max-age=0
Authorization: Negotiate 
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Origin: http://example.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.99 Safari/537.36
Content-Type: application/x-www-form-urlencoded
Referer: http://example.com/Project.aspx?prj=5566
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8
Cookie: ASP.NET_SessionId=4oymd5odmcaluiuzc24tbx22; _gat=1; _ga=GA1.2.1888408676.1418017144

The Request Filtering Setting of Windows Server 2012 R2 is

enter image description here

Any help would be appreciated.

Best Solution

Try adding

EnableViewState="false"

to your aspx page. It looks like Chrome adds the viewstate where IIS expects the request verb.

You might have some luck with this: Fix HTTP.sys

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