What permissions do I need to update SiteCacheSettingsWriter with Powershell?

Question

I'm trying to enable and configure output cache on a site collection with Powershell. But I get an Access denied when running the script.

Exception calling "Update" with "0" argument(s): "Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))"

I'm running the following script and it fails on $cacheSettings.Update():

Add-PSSnapin Microsoft.SharePoint.Powershell -ErrorAction SilentlyContinue
$cacheSettings = new-object Microsoft.SharePoint.Publishing.SiteCacheSettingsWriter("http://siteaddress")
$cacheSettings.EnableCache
$cacheSettings.EnableCache = $true
$cacheSettings.Update()

I'm runing the script with a user that I thought had all the necessary permissions but obviously not. I gave the user permissions with the following command:

Get-SPDatabase | Add-SPShellAdmin mydomain\user

I executed the Add-SPShellAdmin-command with my install-account without any errors. mydomain\user is also site collection administrator for http://siteaddress.

So, what permission am I missing to run the script?

Answer 1

My problem was missing permissions on site collection administrative level. I had permission as site collection administrator when navigating from my local computer through adfs, i.e. with account c:0-.t|adfsfed|username@domain.com. But when running script from the server I'm running them as another user through integrated windows authentication, i.e. with account domain\username. I had to be site collection owner with the correct account to be able to run scripts towards the site collection. And I also needed permission through Add-SPShellAdmin.