Feroze Daud's WebLog

The .NET Framework has a HttpWebRequest object in the System.Net namespace. This object allows you to talk to HTTP Servers. Usually, people forget that the underlying connection created by the request is not freed up,unless you call Close() on the response...

The topic of this post is PreAuthentication. HTTP Webservers support multiple authentication options. On Windows, IIS supports Basic, NTLM, Digest, Negotiate (a.k.a Integrated Windows Authentication). Of these, Basic & Kerberos support PreAuthentication...

A user posted on the newsgroups asking about how to set Host headers in HttpWebRequest. HttpWebRequest does not allow the host header to be set by the user. It is set automatically from the URI supplied to HttpWebRequest constructor. However, it...

In whidbey, System.Net has a cool retail tracing implementation. It writes most calls made to public API's to a TraceListener. You can setup your own tracelisteners, or use the config file to setup a default listener. This facility is very useful in...

This topic is about the asynchronous programming model, and how it is used when doing Networking. Introduction to Asynchronous Programming The DotNetFramework supports an asynchronous programming model that is uniform across all classes & features...

The other day, somebody asked me: How do I download a webpage, or other content from a webserver, where the content is stored using a specific encoding ? They want to do this using for eg: System.Net.HttpWebRequest Why is this necessary ? Well, for starters...

If you see the ping utility that comes with your OS, you will notice that it has many options. However, the one we are going to develop will just take one argument: C:\ping>ping <hostname> | <ipaddress> Example: ping www.contoso...

When doing authentication, HttpWebRequest manages connections differently, depending on the authentication mode being used. If it uses Windows Integrated Authentication, it will close the connection after every request completes. The reasons for this...

In Part II of this article, we saw how we are going to use the ICMP protocol to implement a simple Ping client. We also saw a skeleton of this program which showed how to translate the ICMP packet specification into a C# structure. In this part...

After a long hiatus, I am back to posing to my blog. I am going to start out with a series on Socket programming. In this series, I will show you how to implement a simple Ping client using classes from the System.Net.Sockets namespace. It should...

In this part, we will add some networking code to the code we have thus far. When we get done, we should have a working Ping utility. Take the program that we wrote in the Ping: Part III and add the following code. using System; using System...

Someone sent me a link which talks about how printers are embedding tracking information in pages that they print. Spooky! http://story.news.yahoo.com/news?tmpl=story&cid=1093&e=4&u=/pcworld/20041122/tc_pcworld/118664

Durgaprasad, the test lead for System.Net has a very informative entry on using Tracing facilities in whidbey. http://blogs.msdn.com/dgorti/archive/2005/09/18/471003.aspx

In a previous blog post, I wrote about how printer manufacturers are embedding tracking information in their printers. Well, today, via Slashdot, I learned that folks at EFF have figured out the encoding in atleast one printer (those made by Xerox...

I have been stumped from time to time on how to attach VS debuggers to a process on process startup. I knew how to do it with Windbg, by setting ImageFileExecutionOptions for the target process. However I did not know how to do it for VS. Well, I need...

This post is going to give an explanation of what the various greetings mean, for the autoattendant. The posting will be divided into two sections. First, I will describe the common structure. Next, I will describe how this manifests itself at runtime...

Many a time, I had to look at eventlog files sent by a customer, or those from a test run that happened some time back. These files (.evt) are offline copies of eventlogs. To view them, you open them up with eventviewer. However, you might sometimes...

Today's lesson is about thread interaction between Asp.Net and the HttpWebRequest object of the System.Net namespace. The CLR provides a threadpool. This facility provides threads for normal work ( worker threads ), I/O work ( I/O threads) and Timer Threads...

If you are the administrator of an Exchange Unified Messaging server, you might want to know why the UM worker process is recycling and how often. The following one line PowerShell script will print out all the reasons why the process recycled: ...

Welcome to my blog! This blog is a place for raves and rants about everything in general, and networking in particular. Watch this space for cool tips and tricks, code samples and other random stuff.

At the beginning of this year, I moved onto a different company. I have joined Zillow as a Software Engineer. I will now be blogging at http://ferozedaud.blogspot.com. Hope to see you there. Cheers!

Exchange 2007 Ships with a tool called test-umconnectivity that can be used to verify the health of your Exchange Unified Messaging installation. It has a couple of modes of operation: Local Voice In this mode, the task will run on a machine that has...

While writing a unit test for a particular feature, I was faced with an interesting problem. My unit test has different scenarios. These scenarios test that a certain data item is propagated all the way down from the called function. For eg, I have...