Cannot communicate with the CMM

Use the information in this section to troubleshoot the compute node when you cannot communicate with the CMM.

Action

Note

Communications errors from compute nodes can take up to 20 minutes to appear in the CMM event log.

Complete the following steps until the problem is solved:

1. Make sure that the protocols that you are using are enabled.
   Note

   By default, only secure protocols, such as, SSH and HTTPS, are enabled.
2. Use a serial cable to connect to the I/O module to further isolate the problem.
3. Reset the CMM to the default settings by pressing the reset button on the CMM.