I want to share what [solved] the problem. I received a reply from Zend.
The message does come from the I5_COMD job. The only way to stop it is to not run I5_COMD. If you are sure you don't need it anymore, then you can prevent it from starting when Zend Server starts. Here is how to do it in Zend Server 5.1.0:
To control which Zend Server daemons start up when the ZENDSVR subsystem is started, please make sure ZENDSVR is in your library list, and then PROMPT (F4) this command:
When prompted, this command displays the following screen:
Automatic job start (ZSAUTOJOB)
Type choices, press Enter.
Monitor daemon (Y/N) . . . . . . Y
Java Bridge daemon (Y/N) . . . . N
Job Queue daemon (Y/N) . . . . . Y
PHP Toolkit service (Y/N) . . . Y ..... change to N ....
Prngd daemon (Y/N) . . . . . . . N
Flag services that are desired to start up automatically with a 'Y'. To prevent I5_COMD from starting up, flag PHP Toolkit service with a 'N'. Press enter for changes to take effect. Please note that the screen always shows default settings, so you must remember to flag all of the services that you want to autostart.
Since I am running the new TookkitApi I don't need the PHP Toolkit Service.
James R. Martin
J Martin Associates