Delivery Reports, Mail Control: Safe handle has been closed

Question

When i try to open Delivery reports from mail control in exchange i get the following error page, i included the stack trace to help make this easier to track down the problem
Safe handle has been closed
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.ObjectDisposedException: Safe handle has been closed
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: 
[ObjectDisposedException: Safe handle has been closed]
   System.Runtime.InteropServices.SafeHandle.DangerousAddRef(Boolean& success) +0
   Microsoft.Win32.Win32Native.GetTokenInformation(SafeTokenHandle TokenHandle, UInt32 TokenInformationClass, SafeLocalAllocHandle TokenInformation, UInt32 TokenInformationLength, UInt32& ReturnLength) +0
   System.Security.Principal.WindowsIdentity.GetTokenInformation(SafeTokenHandle tokenHandle, TokenInformationClass tokenInformationClass) +147
   System.Security.Principal.WindowsIdentity.get_User() +103
   Microsoft.Exchange.Management.ControlPanel.CanaryExtensions.GetUserUniqueKey(HttpContext context) +95
   Microsoft.Exchange.Management.ControlPanel.CanaryExtensions.SendCanary(HttpContext context) +101
   Microsoft.Exchange.Management.ControlPanel.RbacModule.Application_PostAuthenticateRequest(Object sender, EventArgs e) +89
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP
 

Answer 1

Hi,
From the error description, please make sure that all the services Exchange needed are running at first. What's more, I recommend you increase timeout for ECP and then check the result.
Here is a thread about increasing timeout for ECP for your reference:
Cannot open edit groups from ECP
https://social.technet.microsoft.com/Forums/exchange/en-US/c57f40eb-7218-4a48-9efa-8fb687741d54/cannot-open-edit-groups-from-ecp?forum=exchangesvrclients
Hope this can be helpful to you.
Best regards,
Amy Wang
TechNet Community Support