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  • Blog Post: Required permissions when calling a Web service using client certificate for authentication in an ASP.NET Web application

    A Web service requiring Client certificate authentication is a common scenario. You may have a client application which needs to send the Client certificate as part of the web request for accessing the web service. This client application may be a Windows/Console application or another Web application...
  • Blog Post: Getting fatal error LNK1181: cannot open input file 'kernel32.lib'

    I was a happy man until a few hours back when I was playing with some C, C++ programs built using Visual Studio 2008 on my work and home machines. I could write some program on my workstation, copy the solution to my personal laptop at home and thereby continue from where I left in office. Things were...
  • Blog Post: Service Principal Name (SPN) checklist for Kerberos authentication with IIS 7.0/7.5

    In continuation to one of my earlier posts which focused on IIS 6.0 this post is more about the confusion that may arise around SPNs for setting up Kerberos authentication in IIS 7.0. IIS 7.0 has a new Kernel-mode authentication feature using which the ticket for the requested service is decrypted using...
  • Blog Post: Troubleshooting TS Gateway connectivity on Windows 2008, IIS 7.0

    Here is something which is not my domain but had to learn the hard way. I recently encountered an issue while enabling Terminal Services Gateway (TSG) on Windows 2008 server. TSG is coupled with IIS 7.0 hosted on Windows 2k8 server and that's how I came into picture. TSG in simple terms is a feature...
  • Blog Post: Some tips if your IIS 6.0 World Wide Web Service (WWW) ever goes down...

    Well, every time I try writing some thing different than IIS and for some reason I come back to it :-) Here is a quick troubleshooting tip for a scenario where World Wide Web service on my test IIS 6.0 box went down for no apparent reason. Here is what I started seeing when we tried to start all IIS...
  • Blog Post: Enabling Active Directory Isolation mode for FTP to work for trusted domain users

    Let's consider a scenario wherein we have an FTP site hosted on an IIS Server and we are trying to setup the site to work in Active Directory (AD) Isolation mode. Now things should work just fine if we have the setup done properly. I have talked about general setup and common issues with FTP sites here...
  • Blog Post: HTTP to HTTPS (SSL) Web Request Redirection

    We often get requests from our customers asking how they can seamlessly redirect web requests from HTTP to HTTPS, i.e. how they can redirect a non-SSL request to an SSL based request. Recently a colleague of mine got a similar issue and we decided to use some existing scripts that we had in our database...
  • Blog Post: Wildcard SSL certificate in IIS 6.0, Windows 2003 Sp1 and above

    Here I will be talking about configuring SSL wildcard certificates in IIS 6.0 on Win2k3 SP1 and above. You may have a scenario wherein you want to have the same certificate installed for multiple Websites. Now in a normal scenarios this is not possible. What I mean is you cannot have the same certificate...
  • Blog Post: How to setup IIS and AD for Client certificate authentication

    Hi All, This post talks about how Client certificates are configured on websites. I have seen a lot of incidents where people get into issues with client certificate in particular, although server (website) certificates can give a scare at times. Here I will be walking you through the steps of configuring...
  • Blog Post: Kerberos troubleshooting from IIS perspective

    Hi All, This is my first posting in the blog. I really had to take enough courage to start blogging, but with some help from one of my mentors in MS, I am finally here. I hope people really get benefitted from the articles that I post in here. Today, I am going to talk about how to implement...
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