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  • Blog Post: Failing to run ADSI scripts remotely against IIS?

    If you are trying to run an ADSI/WMI Script remotely from a client machine which gets information the from IIS web server around websites etc. you may see this: “ Invalid syntax ” or error code 800401E4 Or Microsoft VBScript runtime error: The remote server machine does not exist or is unavailable: ...
  • Blog Post: WWW Service not listed in the Services console (IIS 6.0)?

    This post is a continuation to the series on IIS service startup issues. I did not feel like writing it since we haven’t seen much cases on this type of behavior and I thought this could be one of those rare issues which always happens with IIS but my customer who bore the brunt of trying to reinstall...
  • Blog Post: Using System.Net trace configuration file to troubleshoot Certificate errors in ASP.Net

    System.Net trace configuration feature in ASP.Net 2.0 onwards is extremely useful when dealing with certificate related errors. Jeff P. Sanders from WinInet/System.Net API Escalation team has written this valuable post for troubleshooting ASP.Net certificate related issues. I am adding it  here...
  • 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: Avoid this confusion around Client certificate mapping in IIS 6.0/7.0

    I just wanted to add this quick post around Client certificate Mapping on IIS. This is focused on 1-to-1/Many-to-1 mapping in IIS 6.0/7.0. If you are interested to know more about configuring Client certificate mapping in IIS 6.0 please check this post of mine and for IIS 7.0 this is an excellent article...
  • Blog Post: Asp.Net Request routing implementation fails with Null Reference exception

    I recently had the pleasure of working on the implementation of Asp.Net Request Routing feature that comes in bundled with .Net Framework 3.5 SP1. This is a cool stuff wherein care has been taken to ensure it can be used independently of MVC Framework. It can be used with Dynamic Data as well as implemented...
  • Blog Post: Some Info around WebDAV content access issues

    If you have a Web folder (WebDAV) hosted on IIS using Basic Authentication there are a few things you need to ensure such that any client accessing the resource does not get into failures. If your WebDAV site is restricted using Basic authentication and you are trying to access it over HTTP, access may...
  • Blog Post: Increase the concurrent connections limit for IIS FTP site if you see server reset

    If you have a FTP site hosted on IIS which receives a burst of client connections at specific intervals and you see the connections getting reset from server-end please read on. Let's say you have over 1500 concurrent FTP client connections being made at every 'n' minute you may see that the IIS FTP...
  • 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: FTP changes not taking effect in IIS 7.0?

    I was working on an FTP issue the other day on IIS 7.0 and I missed something very basic which could have resolved my issue way back had I noticed the nuances of this new model. Normally people tend to go ahead with restarting IIS services for some changes done in the configuration to make sure everything...
  • Blog Post: Who knows! You may be missing these points for Kerberos authentication failures for Web applications...

    I am sharing here some of the general + elusive + ignored + must-have info that you may want to recheck when you are troubleshooting a kerberos cum delegation failure scenario and feel like reaching nowhere near the end of the tunnel (resolution!). These are my personal checklists based on experiences...
  • 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: SSL Troubleshooting for IIS Web Sites contd...

    Recently a colleague of mine was working on a customer's case which was a Critical level incident. High pressure job, huhh! The issue was with SSL not working for one of their web sites. They were seeing "Page cannot be displayed" when trying to access this site over SSL. It worked just fine...
  • Blog Post: Unable to access IIsCertMapper object through ADSI

    Today, I was working on an issue where we were trying to add mapping for client certificate for a windows account using ADSI and VBScript. Something similar as below: <% Dim CertObj, vCert vCert = Request.ClientCertificate("CERTIFICATE") Set CertObj = GetObject("IIS://<path>/IIsCertMapper")...
  • Blog Post: You get a Security Alert when you try to access an SSL enabled web site when certificate has been issued by an internal root CA...

    Let's say you have your own internal Root Certificate Authority (CA) and you use it to grant server certificates to your Web sites. You are able to browse to your web site over SSL and can access the page. Things look good so far. However you get an unwanted security alert all the time while accessing...
  • Blog Post: Troubleshooting FTP related issues on IIS 6.0

    Troubleshooting FTP related issues on IIS can be a real pain. If you have not encountered so far you are lucky:-) What I do generally is to create a new FTP site and make it to work rather than working on the already corrupted site. It depends on your personal choice depending upon how much you want...
  • Blog Post: Troubleshooting SSL related issues with IIS

    In this post I am going to discuss troubleshooting SSL server certificate related issues in IIS. Please remember I am no SSL expert...I am an IIS Asp.Net guy and will discuss issues with regard to SSL with IIS. We have seen a lot many times that the issues could have been resolved by our customers...
  • Blog Post: IIS ADMIN service fail to start?

    An issue that causes a lot of headache to Web Admins is when IISADMIN service does not start up for no reason. Here are a quick troubleshooting steps you can do before you look around and yell for help or call into Microsoft Product Support services and shell out some $$. -- Check and Make sure...
  • Blog Post: Unable to see the Project/Web Site link in the Start Page of Visual Studio 2005

    I remember I had worked with a customer on a support incident long way back wherein VS 2005 was not displaying links for Open and Create for Projects and Websites as shown in the screenshot below: In Visual Studio 2005 we were unable to see the Web Site or the Project link in the Start Page as...
  • Blog Post: Troubleshooting Anonymous authentication failures in IIS

    Recently I was checking MSDN and KBs for a quick check on troubleshooting anonymous authentication, and sadly I could not find a single article devoted to it (that's strictly my personal experience). We often get calls on issues related to Anonymous authentication failures and this is something which...
  • Blog Post: Client Certificate revisited....How to troubleshoot client certificate related issues

    Well, I am back to Client certificate again, guess the reason being a lot of support calls that we getting off late are related to any of the following four errors, especially the first two. 403.7 403.13 403.16 403.17 ( I will cover .16 and .17 very briefly since they are very self-explanatory...
  • 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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