Updated March 11th, 2016
The STM server needs to be changed or decommissioned only after disabling the VMan integration. There are possibilities that the old information may still be present in the database if the integration sequence is incorrect. As a result, the VMan server is not able to integrate with the new STM instance.
The following steps help to remove the orphaned data from the VMan database:
psql -U h9pgsu hyper9db
Run the following query:
DELETE FROM cfg_systemconfigs WHERE groupname='stm';