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  • Blog Post: CRL checking by IIS

    · When a Client certificate is presented to an IIS website, IIS looks for the CRL verification to determine the validity of the certificate, much in a similar way a browser does the CRL checking for an SSL enabled website. When IIS receives the client cert it looks into the CDP (CRL Distribution...
  • Blog Post: Internet Explorer 6 may fail to open an SSL Web site after installing MS10-049

    You may see this behaviour when accessing an SSL enabled Website through IE 6.0 after installing MS10-049. “The Page cannot be displayed” This can happen for websites that use TLS security protocol for encryption. If you are experiencing this behaviour please check the following support KB for more information...
  • 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: Debug.Assert does not launch a popup window on IIS7 while debugging in Visual Studio

    If you are trying to debug an IIS 7 hosted web application using Visual Studio and trying to use System.Diagnostics.Debug.Assert()/System.Diagnostics.Trace.Assert() in your code to launch a popup window it will not work. However you can write the output to a log file using the following: < configuration...
  • Blog Post: Are you seeing 401’s too often for HTTP web requests?

    We often hear concerns from our customers saying that they are seeing performance issues because of extra round trips being made to the Web server while requesting for web pages. Where they expected just one sequence of 401.2/401.1/200 (NTLM) or 401.2/200 (Kerberos) they are seeing the sequence more...
  • Blog Post: A simple exe to find DEBUG build for managed modules and DEBUG attribute in Web.Config for Web applications in IIS 6/7

    CAVEAT: Some stories before I get to the point, so you may want to skip to the end. We in Microsoft PSS get lot many cases on a daily basis which are related to performance issues with Web applications developed using ASP.Net and hosted on IIS. Based on my experience with debugging these issues many...
  • 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: 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: 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: IIS ASP.Net Developer Support Group comes with its own Weblog

    Recently we have come up with a dedicated blog site for IIS support group. Our aim is to include topics which will be of relevance to end users with regard to troubleshooting, and technical readiness for IIS ASP.Net including the latest in offering i.e. IIS 7.0. Using this as a medium we will try to...
  • Blog Post: Certificate Trust List not being honored by IIS 5.0/6.0/7.0?

    Something one should be aware of if one is dealing with Client certificate and assuming Certificate Trust List (CTL) will limit the list of Trusted Certificate Authorities (CA's) being sent to the client during the initial SSL handshake. In IIS 5.0 Post MS04-011 update and IIS 6.0/7.0 using CTL's you...
  • Blog Post: How to achieve a feature similar to single logon for multiple web applications using Basic authentication

    Here is something which I recently figured out. This may be very simple to many but thought of sharing it for a wider audience. Let's say you have two ASP.Net web applications running on two different servers. Now, assuming you have a constraint wherein you cannot use Windows integrated authentication...
  • Blog Post: Case Study: Host header, IP and Port combinations within IIS

    Talking about IIS website configurations when it comes to IP Address, Port, Host headers cause a lot of confusion to many Web Administrators. Here I will be going (a bit of unnecessary details though) to explain how the configuration resolves to Websites when a web request comes to IIS. Environment...
  • 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...
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