Created Issue: Access issue creating worksheet [11383]

The following error occurs when we try to create a worksheet. The issue is resolved by setting IIS 7.0 LoadUserProfile to true. We are trying to understand why this is needed and teh secruity implications and if there is a workaround to make this work without having to change the default IIS setting


System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
at System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet)
at System.Security.CodeAccessPermission.Demand()
at System.Environment.get_UserName()
at NPOI.HSSF.Model.InternalWorkbook.CreateWriteAccess()
at NPOI.HSSF.Model.InternalWorkbook.CreateWorkbook()
at NPOI.HSSF.UserModel.HSSFWorkbook..ctor()
at InfWeb.Segment.DownloadList.PerformDownloadExcel(HttpRequest request, HttpResponse response, iSystemControl system) in C:\Projects\dev_c\InfWeb\Segment\DownloadList.cs:line 725
at InfWeb.Segment.DownloadList.PerformDownload(HttpRequest request, HttpResponse response, iSystemControl system) in C:\Projects\dev_c\InfWeb\Segment\DownloadList.cs:line 549
The action that failed was:
Demand
The type of the first permission that failed was:
System.Security.Permissions.EnvironmentPermission
The first permission that failed was:

version="1"
Read="UserName"/>

The demand was for:

version="1"
Read="UserName"/>

The granted set of the failing assembly was:

version="1">

version="1"
Access="Open"/>

version="1"
Allowed="ApplicationIsolationByUser"
UserQuota="512000"/>

version="1"
Flags="Execution"/>

version="1"
Window="SafeTopLevelWindows"
Clipboard="OwnClipboard"/>

version="1"
PublicKeyBlob="002400000480000094000000060200000024000052534131000400000100010095CCD95AF3B39D8BC20544D3F47FD24B53EBC5CCB693EAED116290629F8CD882C827EBD511AD59449224F0718D3F9D03B64945A6C8B6644266001B8C8426185330E3D96DA70AE16D4ACC21B8D4D480F1385C7E924273179375AA88F81380A72FB115712A313379D16AED4AA36208EE3B4A5DD785B06A07B2D868E3227F4495B5"
Name="NPOI"
AssemblyVersion="1.2.5.0"/>

version="1"
Url="file:///c:/xxx/web/bin/NPOI.DLL"/>

version="1"
Zone="Internet"/>

version="1"
Level="SafePrinting"/>


The assembly or AppDomain that failed was:
NPOI, Version=1.2.5.0, Culture=neutral, PublicKeyToken=0df73ec7942b34e1
The method that caused the failure was:
NPOI.HSSF.Record.Record CreateWriteAccess()
The Zone of the assembly that failed was:
Internet
The Url of the assembly that failed was:
file:///c:/xxx/web/bin/NPOI.DLL
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)
at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args)
at ...