UpdateStats fails if it runs more than two hours (message AWSJCO084E given)

When running the UpdateStats command in a large plan, if the job run time exceeds two hours, the job fails with messages that include the following: 
AWSJCO084E The user "UNAUTHENTICATED" is not authorized to work with the  
           "planner" process.

Cause and solution:

This error occurs because the large number of jobs in the plan has caused the job run time to exceed two hours, which is the default timeout for the user credentials of the WebSphere® Application Server.

To increase the timeout so that the UpdateStats command has more time to run, perform the following steps:
  1. Browse to the following path:
    On Windows systems
    <TWA_home>\usr\servers\engineServer\configDropins\defaults
    On UNIX systems
    <TWA_home>/usr/servers/engineServer/configDropins/defaults
  2. Edit the expiration attribute for LTPA as necessary. The attribute is expressed in minutes and the default value is 24 hours:
    <ltpa keysPassword="{xor}Ozo5PiozKw==" keysFileName="${server.config.dir}/resources/security/ltpa.keys" expiration="1440"/>
  3. Copy the file to the following path:
    On Windows systems
    <TWA_home>\usr\servers\engineServer\overrides\
    On UNIX systems
    <TWA_DATA_DIR>/usr/servers/engineServer/overrides/