The upgrade stops at the phase of PREP_INIT/SETSYNC_PREP_STARTED.
You can find the following error in the PHASES.log:
1EETQ399 Last error code set is: No synchronization mechanism available
1EETQ204 Upgrade phase "SETSYNC_PREP_STARTED" aborted with severe errors ("xxxxxxxxxxxx")
SUM, common GUI, URL, SETSYNC_PREP_STARTED, aborted , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem
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