How to troubleshoot when having error 'No data available' for Memory Usage?

How to troubleshoot when having error 'No data available' for Memory Usage?

Problem:  "No data available" message shown for Memory Usage while trying to monitor Linux servers.

Solution:

  1. The connection must be established only through TELNET or SSH mode.
  2. Check whether the below command runs and displays the corresponding output in the system. 
    free -m

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