I’ve already mentioned this in my old blog post (along with GUI way for this task), but just posting this separately for better visibility/searcheability 
In case you need to obtain thumbprint value of your K2 site HTTPS certificate (or any other certificate) you can use this PowerShell script:
Write-Host (Get-ChildItem -Path Cert:\LocalMachine\My | Where-Object {$_.Subject -match "K2.domain.com"}).Thumbprint;
If necessary you can put it into variable and reuse in other commands/script, just replace “Write-Host” with “$thumbprint = ” to store certificate thumbprint value in $thumbprint variable. Just don’t forget to change filter argument “K2.domain.com” to something that is relevant for your certificate.
