Issue: When I open Exchange PowerShell, I have seen that PowerShell is not able to connect properly and displaying the following error message:

New-PSSession : [EXCHANGESERVER.DOMAIN.LOCAL] Connecting to remote server EXCHANGESERVER.DOMAIN.LOCAL failed with the following error message : The WS-Management service cannot process the request. The load quota for the system has been exceeded. Send future requests at a slower rate or raise the system quota. 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 : -2144108120,PSSessionOpenFailed

Resolution: Go to IIS Management -> Application Pools ->MSExchangePowerShellAppPool

Click Recycle to recycle the pool

Done ! Try to open the PowerShell again and the issue should be resolved !