This post is also available in: Polish
Sometimes you want to know how many users connect do your Exchange 2010 Client Access Servers. This information is useful then you are using Network Load Balancer or Hardware Load Balancer.
Then you can easily check if it works perfectly.
Information about users connections to specified CAS server you can get from Counters:
- MSExchange RpcClientAccess\User Count
- MSExchange OWA\Current Unique Users
You can get value of those counters using Exchange Management Shell and paste following powershell code:
$CASServers = Get-ClientAccessServer | select name
Foreach ($srv in $CASServers){
$RPC = Get-Counter "\MSExchange RpcClientAccess\User Count" -ComputerName $srv.name
$OWA = Get-Counter "\MSExchange OWA\Current Unique Users" -ComputerName $srv.name
New-Object PSObject -Property @{
Server = $srv.name
"RPC Client Access" = $RPC.CounterSamples[0].CookedValue
"Outlook Web App" = $OWA.CounterSamples[0].CookedValue
}
}
You only need to have access to all CAS servers, then you will get result like below:
English 
polski
That’s nice. I have a basic version of this script over at:
http://oxfordsbsguy.com/2013/06/20/powershell-identify-the-number-of-users-connected-to-a-exchange-2010-cas-server/
I’ve been trying to figure out the best way to identify which users are connected to which CAS server, the only way I found was to check the iis logs on each server, which isn;t very dynamic. Do you know of a better way?
Thanks,
Carl
Hi
To identify which users are connected to which CAS server you can try to use Get-LogonStatistics
You will get information about ClientName – CAS server when you specirfy ApplicationId like Client=MSExchangeRPC or ApplicationId like Client=OWA.
Then you need to add LogonTime and you will get what you want.
Carl,
Your script worked a little better by specifing the actual servers. I’m guessing my 2007 cas servers were causing the issue.
What is really odd is this script doesn’t run in our Exchange 2010 SP2 5v2 behind a HLB environment but it does run in our Exchange 2010 SP3 RU1 Test Environment, that isn’t behind a HLB.
[PS] C:\>./rpcactiveconnections.ps1
Get-Counter : The specified object was not found on the computer.
At C:\rpcactiveconnections.ps1:4 char:20
+ $RPC = Get-Counter <<<< "MSExchange RpcClientAccess\User Count" -ComputerName $srv.name
+ CategoryInfo : InvalidResult: (:) [Get-Counter], Exception
+ FullyQualifiedErrorId : CounterApiError,Microsoft.PowerShell.Commands.GetCounterCommand
Cannot index into a null array.
At C:\rpcactiveconnections.ps1:7 char:44
+ "RPC Client Access" = $RPC.CounterSamples[ <<<< 0].CookedValue
+ CategoryInfo : InvalidOperation: (0:Int32) [], RuntimeException
+ FullyQualifiedErrorId : NullArray
Get-Counter : The specified object was not found on the computer.
At C:\rpcactiveconnections.ps1:4 char:20
+ $RPC = Get-Counter <<<< "MSExchange RpcClientAccess\User Count" -ComputerName $srv.name
+ CategoryInfo : InvalidResult: (:) [Get-Counter], Exception
+ FullyQualifiedErrorId : CounterApiError,Microsoft.PowerShell.Commands.GetCounterCommand
Cannot index into a null array.
At C:\rpcactiveconnections.ps1:7 char:44
+ "RPC Client Access" = $RPC.CounterSamples[ <<<< 0].CookedValue
+ CategoryInfo : InvalidOperation: (0:Int32) [], RuntimeException
+ FullyQualifiedErrorId : NullArray
Server
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server1
server2
server3
server4
Hi
I’ve checked this script with Exchange 2010 SP2 RU5v2 and it works, but I don’t use HLB.
In your environment with HLB can you try to run:
Get-ClientAccessServer | select name
Will you get all yours CAS servers ?
next try to run:
Get-Counter “\MSExchange RpcClientAccess\User Count” -ComputerName casservername
Did you get any value or just error ?
maybe you don’t have needed rights or WinRM enabled ?
Maybe HLB is the problem, but I can’t check that.
Both those commands worked fine and I subbed the -ComputerName actualservername.
I’m not a scripting guru so do I need to sub my actual cas server host names in the script above?
You should get your cas server names in variable $CASServers
$CASServers = Get-ClientAccessServer | select name
then run $CASServers you should get list of your cas servers.
try to run
Get-Counter “\MSExchange RpcClientAccess\User Count” -ComputerName casservername
where casservername use cas server name where you are logged, do you get any value ?
next run again Get-Counter “\MSExchange RpcClientAccess\User Count” -ComputerName casservername
but use as casservername other cas server name where you are now not logged, will you get any value ?
I will try again tomorrow. It did however return our legacy 2007 cas servers when I ran the Get-ClientAccessServer | select name
command. maybe the full script doesn’t like the 07 servers.
This command worked fine when i used the casservername of the cas server i was logged into:
Get-Counter “\MSExchange RpcClientAccess\User Count” -ComputerName casservername
I will try tomorrow with a different cas server which I’m not logged into.
I am trying to add ActiveSync to this one….
$CASServers = Get-ClientAccessServer | select name
Foreach ($srv in $CASServers){
$RPC = Get-Counter “\MSExchange RpcClientAccess\User Count” -ComputerName $srv.name
$OWA = Get-Counter “\MSExchange OWA\Current Unique Users” -ComputerName $srv.name
$ASY = Get-Counter “\MSExchange ActiveSync\Current Requests” -ComputerName $srv.name
New-Object PSObject -Property @{
Server = $srv.name
“RPC Client Access” = $RPC.CounterSamples[0].CookedValue
“Outlook Web App” = $OWA.CounterSamples[0].CookedValue
“ActiveSync” = $ASY.CounterSamples[0].CookedValue
}
}
It works well except the part that it gives me activesync first and then server name.
try this it should work:
Function New-Array {,$args}
$Report = new-array
$CASServers = Get-ClientAccessServer | select name
Foreach ($srv in $CASServers){
$RPC = Get-Counter “\MSExchange RpcClientAccess\User Count” -ComputerName $srv.name
$OWA = Get-Counter “\MSExchange OWA\Current Unique Users” -ComputerName $srv.name
$ASY = Get-Counter “\MSExchange ActiveSync\Current Requests” -ComputerName $srv.name
$cas = New-Object System.Object
$cas | Add-Member -type NoteProperty -name Server -value $($srv.name)
$cas | Add-Member -type NoteProperty -name RPCClientAccess -value $($RPC.CounterSamples[0].CookedValue)
$cas | Add-Member -type NoteProperty -name OWA -value $($OWA.CounterSamples[0].CookedValue)
$cas | Add-Member -type NoteProperty -name ActiveSync -value $($ASY.CounterSamples[0].CookedValue)
$Report += $cas
}
$Report
Thanks for the script!
How can I export the result to a csv-fil? I would like to shedule the script to run every 10 min and collect the data.
Just run $Report | Export-CSV d:\scripts\data.csv