This issue has been raised three times before (the first by me), but in the wrong forums.
me uninstall 9.12 - Adabas-Natural - Software AG Tech Community & Forums
Sue Northcott Adabas Manager Communication Client is not running - Adabas-Natural - Software AG Tech Community & Forums
Elias Reddan Adabas Manager Communication Client is not running - Adabas-Natural - Software AG Tech Community & Forums
The fixes available in Empower have not resolved the issue.