Http Client Protocol Issues (and other fun stuff I support)

This error message is caused because the process is not being able to validate the Server Certificate supplied by the Server during an HTTPS (SSL) request. The very first troubleshooting step should be to see if the server supplied certificate and every...

I like to build and run with UAC on. When running the HttpCalculatorService example I got this error: Failure: errorCode=0x80070005 Unable to add URL to HTTP URL group. Access is denied. Running from an administrator command prompt I do not get the...

Please send me a message or leave a comment to let me know if this Post helped you! When you try to make an HTTP request in an application that is built on the .NET Framework, you may receive one or more of the following error messages or Exceptions...

The following vb Script can fail with an "Access is denied" error message: Dim aRequest Set aRequest = CreateObject ("Microsoft.XMLHTTP") aRequest.Open "POST"," http://www.contoso.com/PostAccepter.aspx",False aRequest.setRequestHeader "Content-Type...

Problem System.Net Tracing (see My Favorite System.Net Tracing File ) revealed that we are getting the 407 error and the .NET framework is not retrying the request with Credentials. System.Net Error: 0 : [4811] Exception in the HttpWebRequest#33574938...

The following code worked fine on IIS 6 but when used on IIS it failed: System.DirectoryServices. DirectoryEntry iisServer; iisServer = new System.DirectoryServices. DirectoryEntry ( "IIS://jsanders4/W3SVC/1" ); System.DirectoryServices. DirectoryEntry...

Your get one of these errors when running Internet Explorer: Stop running this script? A script on this page is causing Internet Explorer to run slowly. If it continues to run, your computer might become unresponsive. "A script on this page is causing...

This took me a couple of minutes to find so I thought I would share this here. I downloaded ProcMon (process monitor) and could view the help file. It would open but the right pane had a message: "Navigation to the webpage was canceled" The left pane...

This article is a great help http://support.microsoft.com/kb/915599 however, there is another potential cause. If the target server resets the connection without replying with an HTTP status (for example 200 OK) you can also get this error. Solution,...

Overview You can solve issues encountered when using the HTTP protocol by applying the principles in this article. By simplifying the issue into a small reproducible problem you can effectively troubleshoot and resolve most problems encountered in code...

This was an interesting error that I had to hunt down. When specifying a proxy server in .NET like this: WebProxy("https://someproxyserver") you will get this error. You will get this error for whatever scheme that you enter before the "://" characters...

To understand these settings you need to understand how the HttpWebRequest class relates to the ServicePointManager and ServicePoint classes. When you make a request with the HttpWebRequest class, the ServicePointManager provides a ServicePoint object...

There seems to be no simple end-to-end walkthrough for creating a simple HttpListener based SSL Listener that includes how to configure the computer by generating and installing a Certificate for this listener. Basic concepts covered: Write the...

Understanding Problems with MS10-049, KB 980436 and IETF RFC5746 Microsoft released a Security update MS10-049: Vulnerabilities in SChannel could allow remote code execution. This update patches vulnerabilities in SChannel (TLS) that can be exploited...

Often you need to correlate a .NET trace with a Netmon trace. To do that you need the date and time of the call from the System.Net trace . This will do it! NOTE: This section is configures where the log file is and where it should be written: initializeData...

CHttpServer and CHttpFilter are not included in Visual Studio 2008. You will get error messages such as: fatal error RC1015: cannot open include file 'afxisapi.rc' fatal error C1083: Cannot open include file: 'afxisapi.h': No such file or directory ....

I know... This is a simple thing, but there is no documentation on it so here it is: UPDATE: You can now use Windows Webservica API (WWSAPI) to create native code WebService calls! The SoapToolkit (STK) is out of support. So what if you need to...

There are two different structures you can query in order to retrieve server certificate information. You must do some sort of request to complete the SSL server certificate exchange, and then you can retrieve this information. Here is an example of that...

I was anxious to see what real memory usage would look like on my low end netbook. It was better than Windows 7! Less than 500M. One problem I had was the native resolution of my netbook is1024X600 and the will not load Windows Store applications at that...

By design the WebBrowser Control does not close the parent Form when WebBrowser Control is closed. Here is one way you can accomplish this. The WebBrowser will send a WM_NOTIFYPARENT notification that can be captured and an event raised that a host...

WinhttpTracecfg.exe for Vista does not exist, so how can you get a WinHttp trace in Vista and above? WinHttpTraceCfg.exe has been replaced in Vista and above with the netsh winhttp command. see this blog: http://blogs.msdn.com/wndp/archive/2007/03...

UPDATE: Replace ATLServer with WWSAPI! Windows Web Services API Client code walkthrough When I tried to build an old ATLServer WebClient SOAP project I got these errors: fatal error C1083: Cannot open include file: 'atlsrvres.h': No such...

Starting with Windows XP SP2, the Crypto API CRL check uses WinHttp (see: http://support.microsoft.com/kb/887196 ). This can cause some confusion with network administrators and developers since they might have set proxy information for WinInet or applications...

Strange. I found in my personal website the Child menus were not showing when I hovered over the root menu item. There is nothing special about the menus. They are standard asp:menu items created when I dragged the menu tool from the navigation tools...

Session state for a web site is often stored in cookies. If you use the WebBrowser control in an program and the target website responds to an action with a call to Window.Open , then mysteriously the cookies for that site are not transmitted with the...