When adding a DB2 database to be monitored an Host agent is being created automatically. This new host agent has the type UnixAgentPlus. If the DB2 database is running on AIX server, the UnixAgentPlus will not work. For AIX machines the UnixAgent needs to be created.
A change request has been created. CR number: DB2FOG-160. A fix for this issue has been included in the 188.8.131.52 and higher releases of the DB2 cartridge.