André Krijnen

I ran today in this message in the SiteManager.aspx of SharePoint Server 2010: there was an error in the callback content and structure

So allright, I checked the search engines and did find some answers regarding this problem, but you know what. When restart your IIS server on your Web Front End the message doesn’t go away. Hmm odd, how could that be, well I figured out that it does a call back to another server, in my case it was one of the other SharePoint Servers in the farm. After resetting this server it removes the message and everything works fine again.

The last couple of days I was working at a customer where Kerberos was needed for SharePoint 2010. Of course I started to set the different Service Principal Names for my App Pool accounts, farm accounts, machines, etc. Not to hard to do it, but I ran everytime in a 401 error: The requsted resources requires user authentication.
Strange I thought, but yet I sended the Domain Administrator more commando’s and it didn’t help. So I checked everything, checked for duplicates, etc. Still I ran into these errors.

After some search I found out that there are some problems with IIS 7.0 regarding Kerberos, and I needed to configure the applicationHost.config to solve these issues with Kerberos. enabled the kernel activation mode, etc. But, it didn’t make any difference, rebooted several times, removed the Kernel Activation Mode and removed again the changed on the applicationHost.config.

I knew that we’ve made C-Name records and it gave me a wonderfull idea to change the C-Name records to A records. These changes where applied, and wow, in less time as expected I opened IE and opened the different web apps. In less then a second the page was displayed from my web app. When you run in these problems, change your C-Name record to A-record and it will fix all your problems with SPN’s, Kerberos and IIS 7.0