Change to session cookies for Claims Based Authentication

When you log into SharePoint using Claims Based Authentication, a cookie is written to disk to store the Claims information, which prevents you having to be authenticated each time you open a new browser or re-boot.
You can change the cookie to be session based by running this PowerShell script:

$sts = Get-SPSecurityTokenServiceConfig
$sts.UseSessionCookies = $true
$sts.Update()
iisreset

You can revert back to a disk based cookie (default) by running this:

$sts.UseSessionCookies = $false
$sts.Update()
iisreset

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