asp.net within a hosted environment and Castle.Windsor -> Required permissions cannot be acquired

I am developing an asp.net 3.5 web application which is running perfectly on my local IIS server but gets me into a lot of trouble when publishing it to a hosted (1and1) environment.

When the web.config is loaded an "System.Security.Policy.PolicyException: Required permissions cannot be acquired." exception is thrown. The stack trace indicates that this is caused by my using of the Castle.Windsor framework:

[PolicyException: Required permissions cannot be acquired.]
System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Boolean checkExecutionPermission) +7606231
System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Int32& securitySpecialFlags, Boolean checkExecutionPermission) +57

[FileLoadException: Could not load file or assembly 'Castle.Windsor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0 System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +43
System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +127
System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +142 System.Reflection.Assembly.Load(String assemblyString) +28
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +46

[ConfigurationErrorsException: Could not load file or assembly 'Castle.Windsor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +613
System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +203 System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +105
System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +178
System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, String outputAssemblyName) +54 System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp) +232
System.Web.Compilation.BuildManager.CompileGlobalAsax() +51
System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +337

[HttpException (0x80004005): Could not load file or assembly 'Castle.Windsor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +58 System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +512 System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters) +729

[HttpException (0x80004005): Could not load file or assembly 'Castle.Windsor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=407dd0808d44fbdc' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)] System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +8921851
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +85 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +333

I am pretty limited in investigate this problem due to the hosted environment restrictions - specifically I am unable to review the the machine.config and the IIS configuration. The one fact I know for sure is that it is running on a 2.0.50727.5456 framework... The hosters customer service is neither competent nor willing to help so I have to do it on my own.

Any suggestions how to take a deeper look into the causes or how to simply resolve this is really appreciated.

I found out that 1&1 uses a general medium trust-level for all hosted asp.net applications. It strongly seems that Castle Windsor is not able to run under such an permission-restricted environment (for instance reflection is not available there).

Fortunately there are a lot of alternatives (see which-ioc-runs-in-medium-trust) which can be used under such circumstances. I simply used simple injector which is a tiny (but for my purposes powerful-enough) IoC container and it does a great job and solved all my permission-problems.