During an upgrade we cannot modify the server.xml in the updates folder. Whenever we re-run the upgrade the server.xml file gets overwritten, we lose our changes, and the upgrade fails to start.
When start_upgrade_wizard.bat is run either manually or via the UI it runs updateFramework_windows_1_0.exe which overwrites the modified server.xml file in the \SymantecDLP\Protect\updates\<update-id>\framework\conf folder.
We need to launch the upgrade server manually after creating the framework files initially and modifying them with our settings.