Powershell – Viewing and Logging IIS Sessions

The commands below are helpful when troubleshooting and could be beneficial when designing for scalability. They can easily be scripted and logged for data analysis.

Current Anonymous Users – the number of anonymous IIS users
Current Non-Anonymous Users – the number of authorized IIS users
Current Connections – total number of active connections on the IIS server

The following may be used to display a list of every Web Service performance counters currently available:

(Get-Counter -ListSet’Web Service’).counter

PS C:\> (Get-Counter -ListSet 'Web Service').counter
\Web Service(*)\Total Bytes Sent
\Web Service(*)\Bytes Sent/sec
\Web Service(*)\Total Bytes Received
\Web Service(*)\Bytes Received/sec
\Web Service(*)\Total Bytes Transferred
\Web Service(*)\Bytes Total/sec
\Web Service(*)\Total Files Sent
\Web Service(*)\Files Sent/sec
\Web Service(*)\Total Files Received
\Web Service(*)\Files Received/sec
\Web Service(*)\Total Files Transferred
\Web Service(*)\Files/sec
\Web Service(*)\Current Anonymous Users
\Web Service(*)\Current NonAnonymous Users
\Web Service(*)\Total Anonymous Users
\Web Service(*)\Anonymous Users/sec
\Web Service(*)\Total NonAnonymous Users
\Web Service(*)\NonAnonymous Users/sec
\Web Service(*)\Maximum Anonymous Users
\Web Service(*)\Maximum NonAnonymous Users
\Web Service(*)\Current Connections
\Web Service(*)\Maximum Connections
\Web Service(*)\Total Connection Attempts (all instances)
\Web Service(*)\Connection Attempts/sec
\Web Service(*)\Total Logon Attempts
\Web Service(*)\Logon Attempts/sec
\Web Service(*)\Total Options Requests
\Web Service(*)\Options Requests/sec
\Web Service(*)\Total Get Requests
\Web Service(*)\Get Requests/sec
\Web Service(*)\Total Post Requests
\Web Service(*)\Post Requests/sec
\Web Service(*)\Total Head Requests
\Web Service(*)\Head Requests/sec
\Web Service(*)\Total Put Requests
\Web Service(*)\Put Requests/sec
\Web Service(*)\Total Delete Requests
\Web Service(*)\Delete Requests/sec
\Web Service(*)\Total Trace Requests
\Web Service(*)\Trace Requests/sec
\Web Service(*)\Total Move Requests
\Web Service(*)\Move Requests/sec
\Web Service(*)\Total Copy Requests
\Web Service(*)\Copy Requests/sec
\Web Service(*)\Total Mkcol Requests
\Web Service(*)\Mkcol Requests/sec
\Web Service(*)\Total Propfind Requests
\Web Service(*)\Propfind Requests/sec
\Web Service(*)\Total Proppatch Requests
\Web Service(*)\Proppatch Requests/sec
\Web Service(*)\Total Search Requests
\Web Service(*)\Search Requests/sec
\Web Service(*)\Total Lock Requests
\Web Service(*)\Lock Requests/sec
\Web Service(*)\Total Unlock Requests
\Web Service(*)\Unlock Requests/sec
\Web Service(*)\Total Other Request Methods
\Web Service(*)\Other Request Methods/sec
\Web Service(*)\Total Method Requests
\Web Service(*)\Total Method Requests/sec
\Web Service(*)\Total CGI Requests
\Web Service(*)\CGI Requests/sec
\Web Service(*)\Total ISAPI Extension Requests
\Web Service(*)\ISAPI Extension Requests/sec
\Web Service(*)\Total Not Found Errors
\Web Service(*)\Not Found Errors/sec
\Web Service(*)\Total Locked Errors
\Web Service(*)\Locked Errors/sec
\Web Service(*)\Current CGI Requests
\Web Service(*)\Current ISAPI Extension Requests
\Web Service(*)\Maximum CGI Requests
\Web Service(*)\Maximum ISAPI Extension Requests
\Web Service(*)\Current CAL count for authenticated users
\Web Service(*)\Maximum CAL count for authenticated users
\Web Service(*)\Total count of failed CAL requests for authenticated users
\Web Service(*)\Current CAL count for SSL connections
\Web Service(*)\Maximum CAL count for SSL connections
\Web Service(*)\Total count of failed CAL requests for SSL connections
\Web Service(*)\Total Blocked Async I/O Requests
\Web Service(*)\Total Allowed Async I/O Requests
\Web Service(*)\Total Rejected Async I/O Requests
\Web Service(*)\Current Blocked Async I/O Requests
\Web Service(*)\Measured Async I/O Bandwidth Usage
\Web Service(*)\Total blocked bandwidth bytes.
\Web Service(*)\Current blocked bandwidth bytes.
\Web Service(*)\Service Uptime


Use this command to find out how many connections are now active on the IIS server (the counter Web Service(*)Current Connections):

Get-Counter -Counter “\Web Service(*)\Current Connections”

PS C:\> Get-Counter -Counter “\Web Service(*)\Current Connections”
Timestamp CounterSamples
--------- --------------
8/4/2022 10:52:10 AM \\cordero-web1\web service(_total)\current connections :
  \\cordero-web1\web service(accounting)\current connections :
  \\cordero-web1\web service(hr)\current connections :


You may take advantage of the environment variable COMPUTERNAME to avoid having to give the server name each time:

Get-Counter “web service(Site1)\current connections” -ComputerName$env:COMPUTERNAME

With the Get-IISSite and Get-Website cmdlets, you may learn more about Internet Information Services (IIS) websites, including their current status and other vital details.  With the Get-IISAppPool cmdlet, you can learn more about application pools, their current state, and other vital details.


PS C:\> Get-IISSite
Name            ID      State       Physical Path                   Bindings
----            --      -----       -------------                   --------
accounting      1       Started     C:\inetpub\websites\accounting  http *:80:accounting.cordero.me
                                                                    https *:443:accounting.cordero.me
hr              2       Started     C:\inetpub\websites\hr          http *:80:hr.cordero.me
                                                                    https *:443:hr.cordero.me

PS C:\> Get-Website
Name            ID      State       Physical Path                   Bindings
----            --      -----       -------------                   --------
accounting      1       Started     C:\inetpub\websites\accounting  http *:80:accounting.cordero.me
                                                                    https *:443:accounting.cordero.me
hr              2       Started     C:\inetpub\websites\hr          http *:80:hr.cordero.me
                                                                    https *:443:hr.cordero.me
PS C:\> Get-IISAppPool
Name            Status      CLR Ver         Pipeline Mode       Start Mode
----            ------      -------         -------------       ----------
AcountingWeb    Started     v4.0            Integrated          OnDemand
HRWeb           Started     v4.0            Integrated          OnDemand