WSSA 6.1.1 installed on Windows host
Installation run with MCU=1 parameter to make sure enabled (msiexec -I C:\downloads\wssa-installer.msi /passive MCU=1)
Admin then tried to deploy the WSSA 7.2.1 MSI file with Microsoft SCCM
WSSA 7.2.1 install works but user cannot connect to the host afterwards afterwards
- The installation works when an interactive user is logged into workstation but fails if no user logged in
The MCU option only takes effect on a new install - so they need to uninstall 6.x first, and then install 7.x with the MCU option.
Only if you are changing your MCU value do you need to do a clean install.
When the issue happens, uninstall WSSA 6.x first, and then install WSSA 7.x with the MCU option
f you have already installed with MCU (i.e. when upgrading from 7.1 to 7.2 - if you installed 7.1 with MCU), then there isn't any need at all to specify MCU...it's already installed that way.
It is not recommended that an organization push out MCU=1 to all their endpoints. It should be used in RDP server scenarios only - when you are installing WSSA on an RDP server.