Error "SSLSettingFeatureInIIS Failed to run" when upgrading to ITMS 8.5. RU4

Products

• Client Management Suite
• IT Management Suite

Issue/Introduction

Install Readiness error when upgrading to ITMS 8.5 RU4:

CheckSSLSettingFeatureInIIS Failed to run

A specified logon session does not exist. It may already have been terminated. (Exception from: HRESULT: 0x80070520)

Environment

ITMS 8.5

Cause

Unknown - It appears that the Symantec Installation Manager was not able to successfully run the readiness checks against IIS. 

Resolution

Removed and reinstalled the IIS 6 Management Compatibility role, and then rebooted the Notification Server. The readiness checks then passed without failures, and we were able to successfully complete the upgrade to 8.5 RU4.