hi,

 I am trying to find how many users are connected to my servers. I have 3 servers which hold all roles except edge.

 When I do this entry,

 Get-Counter "\MSExchange RpcClientAccess\User Count" -ComputerName exch01, exch02, exch03 | ft

 I get  this error for one of the servers

 Get-Counter : Unable to connect to the specified computer or the computer is offline.
I have no idea what is causing this. I tried to change the service user for "Microsoft Exchange RPC Client Access" from system to network, stopped the Exchange health manager and restarted the server. Any good Ideas ?

Hi,

How about run this in exch01 with below command:
Get-Counter "\MSExchange RpcClientAccess\User Count" -ComputerName exch01
If it works, please check the connection between exch01, exch02 and exch03.

Moreover, here's an similar article about your question, for your reference: https://support.microsoft.com/en-us/kb/300702

Thanks

 Hi,

 I get the same error.

Hi,

 loks like "Remote Registry" was the problem. I started the service and the problem was gone.

 thanks