Exchange 2013 issues along with toolbox and exchange powershell

Question

I have a server 2012 with exchange 2013, no errors on install, we have about 50 user mailboxes setup. about 3-5 times a day sending and receiving will stop working, we have to reboot about 3 or 4 times then it starts working again. 
Also the Exchange power shell doesnt work, we get :
VERBOSE: Connecting to NVSVMSX.KATV.local.
New-PSSession : [nvsvmsx.katv.local] Processing data from remote server nvsvmsx.katv.local failed with the following
error message: [ClientAccessServer=NVSVMSX,BackEndServer=nvsvmsx.katv.local,RequestId=3c4178cd-3e21-4ebf-9c65-23e5855cf
17f,TimeStamp=11/11/2014 6:53:03 PM]
[AuthZRequestId=b12c2ecf-ff1f-42df-b0f8-441878180bfa][FailureCategory=AuthZ-CmdletAccessDeniedException] The user
"KATV.local/Computers/NVSVMSX" isn't assigned to any management roles. For more information, see the
about_Remote_Troubleshooting Help topic.
At line:1 char:1
+ New-PSSession -ConnectionURI "$connectionUri" -ConfigurationName Microsoft.Excha ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [New-PSSession], PSRemotin
   gTransportException
    + FullyQualifiedErrorId : IncorrectProtocolVersion,PSSessionOpenFailed
we get that 3 times then nothing.
Also on the Toolbox we get MMC error
"Type is not resolved for member "Microsoft.Exchange.Configuration...."
Please help, we are at a loss and not sure what to do at this point, we have looked every where for a permissions issue and have found nothing so far.
thank you
BD

Answer 1

Hi,
Please check if this user was in Organization Management Group. If not, please use the following cmdlet to add this user to this group.
Add-RoleGroupMember “OrganizationManagement” -Member <member>
If this issue still exists, Run Setup /PrepareSchema and Setup /PrepareAD again.
In addition, please refer to this similar thread
https://social.technet.microsoft.com/Forums/sharepoint/en-US/33038c63-a993-4032-9355-023ae91a1c6a/cant-access-ecp-after-install?forum=exchangesvrdeploy
And hope KB 2898571 will be helpful for you.
To solve ToolBox issue, please try to install or uninstall ASP.NET 4.5 on Windows 8 or Windows Server 2012, use one of the following options:
Run the following command from an administrative command prompt: dism /online /enable-feature /featurename:IIS-ASPNET45
For Windows 8 client computers, turn on "IIS-ASPNET45" in "Turn Windows Features On/Off" under "Internet Information Services-> World Wide Web Services -> Application Development Features -> ASP.NET 4.5".
For Windows Server 2012 computers, enable "IIS-ASPNET45" using Server Manager, under "Web Server (IIS) -> Web Server ->Application Development -> ASP.NET 4.5".
Refer from
http://support.microsoft.com/kb/2736284
Best Regards.