Man, I wish I had a few of these certificates in my PKI infrastructure (portfolio)!  Ever need to identify an expired certificate, and or delete the certificate?  Depending on UAC, AppLocker, and other settings, the delete portion may require server logon.

Identify an expired certificate

Few ways to identify an expired certificate on servers.

Via RDP session to server

RDP to server, open MMC > Add Plug In > Certificates > for Computer

Via PowerShell

GCI Cert:\LocalMachine\*

The certificate store file path will vary the above command.

NOTE the SuperUser blog post will help decipher the folder name

Via ‘smart’ PowerShell across multiple machines

Courtesy of Vance Cozier!

“server1”,”server2″| % {invoke-command $_ -scriptblock {$env:ComputerName; GCI Cert:\LocalMachine\* }}

Via Monitoring for expired certificates

Using SCOM Certificate Monitoring or PKI monitoring management packs

Identify Expired certificates

Console navigation steps:

From SCOM console > Monitoring Tab

Expand PKI folder > Expand Certificates and CRLs folder

Click on ‘Certificates – Expired’ state view

Did you know

Run PowerShell commands from Holman’s SCOM Management pack (blog)- github download

Run PowerShell from Monitoring tool

From SCOM console > Monitoring Tab > SCOM Management folder > SCOM Agents

Highlight agent(s)

From Tasks Pane > click on ‘Execute any PowerShell’ task

On the pop-up window, click Override

Adjust timeout to 70 (seconds)

Override command line

Run the following commands (various Certificate store examples provided for removing expired certificates)

Personal Certificates folder

Get-ChildItem Cert:\LocalMachine\My | ? { (( $_.Subject -like “*GlobalSign*” ) -OR ( $_.Issuer -like “*GlobalSign*” )) -and $_.NotAfter -lt (get-date) } | fl Subject,Issuer

Trusted Root folder

Get-ChildItem Cert:\LocalMachine\Root | ? { ( $_.Subject -like “*GlobalSign*” ) -OR ( $_.Issuer -like “*GlobalSign*” ) } | fl  Subject,Issuer

Third Party Root

Get-ChildItem Cert:\LocalMachine\AuthRoot | ? { (( $_.Subject -like “*GlobalSign*” ) -OR ( $_.Issuer -like “*GlobalSign*” )) -and $_.NotAfter -lt (get-date) } | fl Subject,Issuer

Click OK button to close Overrides window

Click OK to run task

View task output

PS C:\Users\admin> Get-ChildItem Cert:\LocalMachine\Root | ? { ( $_.Subject -like “*GlobalSign*” ) -OR ( $_.Issuer

like “*GlobalSign*” ) } | fl Subject,Issuer

Subject : CN=GlobalSign Root CA, OU=Root CA, O=GlobalSign nv-sa, C=BE

Issuer  : CN=GlobalSign Root CA, OU=Root CA, O=GlobalSign nv-sa, C=BE

Subject : CN=GlobalSign, O=GlobalSign, OU=GlobalSign Root CA – R2

Issuer  : CN=GlobalSign, O=GlobalSign, OU=GlobalSign Root CA – R2

Once task completes, go back to the Certificates state view > highlight the certificate > Click the Rediscover Certificates task

Delete PKI certificates

After identifying correct certificate and folder in question that requires deletion:

1. 1. Verify backup of certificate
   2. Test delete via PowerShell window from SCOM

Get-ChildItem Cert:\LocalMachine\AuthRoot | ? { ( $_.Subject -like “*GlobalSign*” ) -OR ( $_.Isser -like “*GlobalSign*” ) } | Remove-Item -DeleteKey

1. Verify Task output shows certificate deleted
2. Refresh MMC GUI > Certificates plug in, and folder to verify certificate deleted
3. Go back to SCOM Console Monitoring Tab
4. Expand PKI folder
5. Expand Certificates and CRLs folder
6. Click on Certificates – Expired state view
7. In Tasks pane on right, click on Rediscover certificates task, Click OK to run
8. Open Health Explorer and reset monitor to clear alert

Alternatively, leverage PowerShell reset logic on SCOM MS, use blog

Documentation

SCOM Certificate monitoring TechCommunity blog https://techcommunity.microsoft.com/t5/system-center-blog/scom-management-pack-for-certificate-monitoring/ba-p/3619299

Download SCOM Certificate monitoring pack https://www.microsoft.com/en-us/download/details.aspx?id=104858

Long-standing PKI certificate pack and blog https://blog.topqore.com/new-version-pki-certificates-monitoring-pack-for-scom/

Identify certificate stores to windows folders https://superuser.com/questions/217719/what-are-the-windows-system-certificate-stores

STIG finding V-69223 https://www.stigviewer.com/stig/zos_tss/2016-06-30/finding/V-69223