JES000052E Job Entry Subsystem (JES) initialization failed. Environment improperly configured. xxxxxxxx

When a server is started, JES performs some validation checks to ensure that databases can be properly allocated. These fail messages indicate that this Initial Validation Process detected an error. The error indicates that the IVP was unable to allocate and test DSN on the system catalog. The likely causes are:

• an error on the JES set tab
• the System Catalog name is invalid or unusable
• the Default Allocation Location is invalid or unusable
• the environment variable MFALLOC_PROP is set