Error after Login in root directory

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   I tryed out IISPassword on a asp.net cms (Kentico). In all subfolders it works like exepted but in the root folder it always shows the Error below after login. Does anyone knows a solution for this problem?Thank you for your help. 
Best regards from Switzerland!

Server Error in '/' Application.

This server variable cannot be modified during request execution. 
Description: 
An unhandled exception occurred during the execution of the current web 
request. Please review the stack trace for more information about the error and 
where it originated in the code. 

Exception Details: 
System.Web.HttpException: This server variable cannot be modified during 
request execution.

Source Error: 

An unhandled exception was generated during the execution of the 
current web request. Information regarding the origin and location of the 
exception can be identified using the exception stack trace below. 

Stack Trace: 

[HttpException (0x80004005): This server variable cannot be modified during request execution.]
   System.Web.HttpServerVarsCollection.SetServerVariableManagedOnly(String name, String value) +4122158
   System.Web.HttpServerVarsCollection.SynchronizeServerVariable(String name, String value) +31
   System.Web.Hosting.IIS7WorkerRequest.GetServerVarChanges(HttpContext ctx) +514
   System.Web.Hosting.IIS7WorkerRequest.SynchronizeVariables(HttpContext context) +54
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +590