We have upgraded SOI from 3.2 CUM3 to 4.0. The manager and one of the UI servers have come up successfully post upgrade. However, one of the other UI server services are not starting post upgrade. It says the file specified does not exist. I tried installing SOI again on this machine and while the installation completes successfully, the services do not start.
The cause for this issue is the file "\SOI\SamUI\webapps\sam\server-config.xml" has empty values for SOI Manager host and other details. So, it seems like Upgrade failed for some reason. Please follow these steps to fix this issue...