Exchange 2010 unable to access EMC or EMS

http://social.technet.microsoft.com/Forums/en/exchange2010/thread/4d396628-3867-4c95-9541-e0eb021e0135

Error message: Connecting to remote server failed with the following error message : The WS-Management service cannot process the request. The system load quota of 1000 requests per 2 seconds has been exceeded. Send future requests at a slower rate or raise the system quota.

I followed MSFT  - Zhang's instruction
1. make sure IIS WinRM extension is installed


2. open powershell and run command : WinRM Quickconfig

3. Open IIS go to Powershell virtual directory and check that SSL in disabled and authentification is set only to Anonymous

4. Open Windows powershell modules

but I can't do
5. run Remove-PowershellVirtualDirectory command


6. run New-PowershellVirtuallirectory command

those two cmd asking for identity.
anyway, I can open the exchange 2010 EMC now.