During my migration from vRSLCM 2.1 patch 2 to the latest version 8 release, I encountered the following error;
Error Code: LCMMIGRATION15102 vRSLCM Migration Failed with SSH is not enabled or Root credential invalid. Please make sure SSH is enabled or porvide the correct root credential by adding the credential to the home page locker app
Pretty obvious error, however the provided root credentials were correct, and I could use putty to connect to my existing LCM instance.