I am trying to add a 3rd server to my webfarm and I'm getting a security exception.  I've done quite a bit of searching and am at a bit of a dead end, I hope you guys can help me.

I am using W2008 Web server (64 bit) with DFS to provide file sharing.  I have 2 other nodes running just fine off the configuration, so I don't think it's the DNN config, it has to be something about the config on the machine.

I think (but am obviously wrong) I set the machine up the same way the other 2 were set up.

I run DNN as a domain user, IIS can connect to the files fine (they're local on C) and the app pool also runs as the domain user (just like the other 2 working machines).  When I try to access the site on the machine, I get the following exception page:

Security Exception 
Description: The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. 

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

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: 


[SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
   System.RuntimeTypeHandle._GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark, Boolean loadTypeFromPartialName) +0
   System.RuntimeTypeHandle.GetTypeByName(String name, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark) +62
   System.RuntimeType.PrivateGetType(String typeName, Boolean throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark& stackMark) +42
   System.Type.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) +77
   System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) +105
   System.Web.Configuration.ConfigUtil.GetType(String typeName, String propertyName, ConfigurationElement configElement, XmlNode node, Boolean checkAptcaBit, Boolean ignoreCase) +64

 --------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50727.3074; ASP.NET Version:2.0.50727.3074 

In the eventlog, I see the following warning:

- 
- 
   
  1310 
  3 
  3 
  0x80000000000000 
   
  196 
  Application 
  WS2.trumsoft.local 
   
  
- 
  3008 
  A configuration error has occurred. 
  5/12/2009 1:56:28 PM 
  5/12/2009 5:56:28 PM 
  a134dfb6bd8144f0a64046c25111159c 
  1 
  1 
  0 
  /LM/W3SVC/2/ROOT-1-128866245880942000 
  Full 
  / 
  C:\Data\Nuke5Share\ 
  WS2 
   
  2344 
  w3wp.exe 
  TRUMSOFT\DotNetNuke 
  ConfigurationErrorsException 
  Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. 
  http://ws2/default.aspx 
  /default.aspx 
  fe80::a5a3:65d7:bf0f:15d8%10 
   
  False 
   
  TRUMSOFT\DotNetNuke 
  5 
  TRUMSOFT\DotNetNuke 
  False 
  at System.Web.Configuration.ConfigUtil.GetType(String typeName, String propertyName, ConfigurationElement configElement, XmlNode node, Boolean checkAptcaBit, Boolean ignoreCase)
 at System.Web.Configuration.Common.ModulesEntry..ctor(String name, String typeName, String propertyName, ConfigurationElement configElement)
 at System.Web.HttpApplication.BuildIntegratedModuleCollection(List`1 moduleList)
 at System.Web.HttpApplication.GetModuleCollection(IntPtr appContext)
 at System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers)
 at System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context)
 at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context)
 at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) 
  
  

Any help would be greatly appreciated!

UPDATE: I changed the pipeline model to classic and got a different (but similar error) from my web.config file, it started complaining about  DotNetNuke.HttpModules.Compression.CompressionModule

So, I did more googling and came up with this:  http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/107/postid/272423/scope/posts/Default.aspx

On suggestion was to change the thread pool to load the profile.  I made that change and it worked!  So then I went to to look at my other servers (they are twins) and they DO NOT have load profile set.

So, I am better off that I was (it works) but am at a loss as to why and I think I should understand what is going on before I put the server into production.

Any thoughts that would shed light on what is going on would be greatly appreciated.