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  • Blog Post: Anonymous PUT in WebDAV on IIS 7+ deprecated

    I have been seeing this question being put up on lot many forums plus we are getting a lot of support cases opened by customers requesting for this feature. In IIS 7+ we have changed the feature of allowing PUT, MKCOL, PROPPATCH, COPY, MOVE, and DELETE to require authentication. Anonymous PROPFINDs...
  • Blog Post: Unexpected 401.1 error over Windows Integrated Authentication on IIS 7.5 website

    I recently added a post to our Support team blog which talks about unexpected 401.1 that you might see when you browse to an IIS 7.5 website over Windows Integrated Authentication. If you are seeing the following in the Error summary on your web page go check this link out. Module WindowsAuthenticationModule...
  • 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: 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: 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: 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: 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: 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...
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