You might need to stop the current instance of the database manager.
Restrictions
The db2stop command can be run only at the server.
No database connections are allowed when running this command; however, if there are any instance attachments, they are forced off before the DB2 database service is stopped.
When you are using the database manager in a partitioned database environment, each database partition server is started as a service. To stop an instance, all services must be stopped.