Why do I get a "pid" or "endpoint" file error when trying to start my MATLAB Production Server (MPS) instance?

When I try to start my MATLAB Production Server (MPS) instance, I get one of the following errors:

Error: ping: main pid file exists, but control endpoint file missing

or

Error: ping: control endpoint file exists, but main pid file missing

How do I resolve this?

Answer 1

[MathWorks Support Team]

The issue occurs if the MATLAB Production Server (MPS) instance process is killed abruptly. Follow the steps given below to resolve this issue.

1. Navigate to MPS script directory, which by default is $MPS_INSTALL/script.
2. From here, run the command below. This will remove working files in the instance directory. These files are usually removed during a graceful shutdown. For more information on using the "mps-stop" command check the following link: https://www.mathworks.com/help/mps/server/mpsstop.html

   mps-stop --purge -C path/to/mpsInstance 

3. The steps above are preferred. However, if you run into further issues, you may manually delete the "main.pid" file from the pid directory, and control & http files from the endpoint directory.
4. After following the steps above, restart your MPS instance.