Bad Request Error 400 Web Service
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platform and distributed applications 400 bad request when POSTing WebService or WCF request from IE ★★★★★★★★★★★★★★★ APGC DSI TeamJanuary 29, 20120 0 0 0 Symptom Let’s suppose such a c# web service 400 bad request scenario: Ø You have a website which enables NTLM authentication. Ø There’s
Bad Request Error 400 Gmail Chrome
a virtual directory under this website, which enables Anonymous authentication. Ø There’s a Web Service or WCF Service in this
Bad Request Error 400 Gmail Firefox
virtual directory. Ø You have a web page in the root directory of the website, and you try to post a request to the Web/WCF Service through AJAX/Silverlight. You will possibly get
Bad Request Error 400 Google Apps
“400 bad request” error for this Web Service or WCF Service call. In some situation, it also happens if you just put the Web/WCF service in the same web folder as the web page but only enable Anonymous authentication for Web/WCF service. Root Cause The below items can explain why the problem happens. A. NTLM is a Challenge/Response protocol, and the authentication bad request error 400 adwords procedure is as below. a. Typically, the client issues an initial anonymous request. When the anonymous request is rejected, IIS returns a 401.2 error and the WWW-Authenticate headers. b. If the client fails or does not support Kerberos, the Negotiate and NTLM header values initiate an NTCR authentication exchange. The client closes the TCP connection, opens a new one, and sends a request that includes an Authorization: NTLM header. This header also includes encoded text that represents the users UserName, ComputerName, and Domain. This text is used by the Windows Security Support Provider Interface (SSPI) to generate the challenge. If the user account is not a local Windows account on the IIS server, the data is passed on to an appropriate domain controller, which then generates the challenge. c. The challenge is sent to the client and IIS returns another 401.2 error. d. The client uses its password and the challenge to create a mathematical hash. The client sends the hash back to the server in another Authorization: NTLM header. e. The server accepts the response, and the local security provider or the appropriate domain controller recreates the sam
Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site error 400 bad request fitbit About Us Learn more about Stack Overflow the company Business Learn more about error 400 bad request android hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is error 400 bad request snapchat a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best https://blogs.msdn.microsoft.com/asiatech/2012/01/29/400-bad-request-when-posting-webservice-or-wcf-request-from-ie/ answers are voted up and rise to the top How can I track down the cause of a 400: Bad Request web service call to localhost? up vote 3 down vote favorite This is on Windows Server 2003 Running IIS. I have an ASP.NET 2.0 website which is also hosting some web services. When the site makes a webservice call to itself (localhost), I get back a http://serverfault.com/questions/414100/how-can-i-track-down-the-cause-of-a-400-bad-request-web-service-call-to-localho 404: Bad Request. I would like to see the actual request coming into IIS, but I can't think of a way to do it. Wireshark doesn't work since it's localhost, Fiddler is useless. I can't modify/redeploy code, but I can reset the machine if I need to. Suggestions? windows-server-2003 iis-6 asp.net web-services 400 share|improve this question asked Aug 3 '12 at 18:38 MStodd 13615 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote accepted I tracked it down by looking at the IIS error log in systemroot\System32\LogFiles\HTTPERR. There I saw that the cause of the 400 was HOSTNAME. From there I determined that localhost was being resolved to a different IP address than the one on which IIS was listening. share|improve this answer answered Aug 16 '12 at 20:49 MStodd 13615 add a comment| up vote 0 down vote You can install and run NetMon on the server. It ain't the greatest thing in the world but it will let you see your traffic. share|improve this answer answered Aug 3 '12 at 19:36 squillman 33.3k868126 this will work for localhost requests? –MStodd Aug 3 '12 at 19:49 add a comment
Server Web App Gallery Microsoft Azure Tools Visual Studio Expression Studio Windows Internet Explorer WebMatrix Web Platform Installer Get Help: Ask a Question in our Forums More Help Resources Blogs Forums HomeLearnTroubleshootChapter 4. Diagnosing HTTP ErrorsTroubleshooting HTTP 400 Errors in IIS Troubleshooting HTTP 400 Errors in IIS By http://www.iis.net/learn/troubleshoot/diagnosing-http-errors/troubleshooting-http-400-errors-in-iis Mike LaingNovember 27, 2012Tools Used in this Troubleshooter: Network Monitor HTTP Error logging This material http://pcsupport.about.com/od/browsers/fl/http-400-bad-request.htm is provided for informational purposes only. Microsoft makes no warranties, express or implied. Overview After sending an HTTP request to an IIS server, an HTTP client (such as Internet Explorer) may display the following type of error message: The webpage cannot be found. HTTP 400 Most likely causes: There might be a typing error in the address. If you clicked on a bad request link, it may be out of date. What you can try: Retype the address. Go back to the previous page. Go to Bing and look for the information you want. If the HTTP client is Internet Explorer, and the Show Friendly HTTP Error Messages option is turned off, the error may resemble the following: Bad Request In these scenarios, IIS has rejected the client's HTTP request because the request did not meet the server's HTTP parsing rules, bad request error or it exceeded time limits, or failed some other rule that IIS or HTTP.sys require incoming requests to adhere to. IIS sends the HTTP 400 - Bad Request status back to the client, and then terminates the TCP connection. Troubleshooting Methods When troubleshooting an HTTP 400 condition, it is important to remember that the underlying problem is that the client has sent a request to IIS that breaks one or more rules that HTTP.sys is enforcing. With that in mind, you will want to see exactly what the client is sending to IIS; to do this, capture a network trace of the client sending the bad request. You can analyze the trace to see the raw data that the client sends to IIS, and to see the raw response data that IIS sends back to the client. You can also use an HTTP sniffer tool called Fiddler; this is a great tool as it allows you to see the HTTP headers even if the client and server are communicating over SSL. The next data item you will want to use is the C:\Windows\System32\LogFiles\HTTPERR\httperr.log file. Beginning in IIS 6.0, the HTTP.sys component handles incoming HTTP requests before they are passed along to IIS, and is the component responsible for blocking requests that don't meet the IIS requirements. When HTTP.sys blocks the request, it will log information to its httperr.log file conce
a 404 Not Found Error 3 How to Fix a 403 Forbidden Error 4 504 Gateway Timeout Error 5 HTTP Status Code Errors About.com About Tech PC Support . . . How-To's & Tutorials Internet & Network How to Fix a 400 Bad Request Error Things to Try When You Get a 400 Bad Request Error Share Pin Tweet Submit Stumble Post Share By Tim Fisher PC Support Expert By Tim Fisher Updated August 24, 2016. The 400 Bad Request error is an HTTP status code that means that the request you sent to the website server, often something simple like a request to load a webpage, was somehow incorrect or corrupted and so the server couldn't understand it.400 Bad Request errors appear differently on different websites so you may see something from the short list below instead of just "400" or another simple variant like that:How You Might See the 400 Error"400 Bad Request""Bad Request. Your browser sent a request that this server could not understand.""Bad Request - Invalid URL""HTTP Error 400 - Bad Request""Bad Request: Error 400""HTTP Error 400. The request hostname is invalid.""400 - Bad request. The request could not be understood by the server due to malformed syntax. The client should not repeat the request without modifications."The 400 Bad Request error displays inside the Internet browser window, just as web pages do. 400 Bad Request errors, like all errors of this type, could be seen in any operating system and in any browser. In Internet Explorer, a The webpage cannot be found message indicates a 400 Bad Request error. The IE title bar will say HTTP 400 Bad Request or something very similar to that.Windows Update can also report HTTP 400 errors but they display as error code 0x80244016 or with the following message: WU_E_PT_HTTP_STATUS_BAD_REQUEST.A 400 error that's reported for a link within a Microsoft Office application will often appear as a The remote server returned an error: (400) Bad Request. message within a small pop-up window.Cause of 400 Bad Request ErrorsThe 400 Bad Request error is oftentimes caused by entering or pasting the wrong URL in the address window but there are some other relatively common causes as well.Note: Web servers running Microsoft IIS often give more specific information about the cause of a 400 Bad Request error by suffixing a number after the 400 as in HTTP Error 400.1 - Bad Request, which means Invalid Destination Header. You c