After the upgrade of Automation Point to a new service pack or release, there is the PPQ error message:
PPQ4000E Error 2, 'No such file or directory'.
It's also displayed in the output of the PPQSTAT.BAT command.
Automation Point 11.7
The PPQ handling is not enabled for TCP/IP
Enable the TCP/IP at the PPQ screen in Automation Point Configuration Manager.
You can find it under Expert Interface, Infrastructures, Program-to-Program Queues.
Mark the 'Enable TCP/IP field and enter the TCP/IP Host names.
It can be the localhost, or when it's needed that every other AP server has access, to the PPQ's then it would be '0.0.0.0'.