The following are best practices and possible solutions to problems that may occur during operation. All the Playbooks have to be run from the root directory of the Test Harness to avoid failures such as "File not found!", because the paths to the needed configuration files are hardcoded into the Playbooks. If the setup_env.sh fails, for debugging, remove &> /dev/null from the failed command. Then the output of the command will be printed, and will not be redirected to /dev/null anymore. When setup the uCPE Manager to be used by the TH using setupuCPEManager.yml Playbook, if the uCPE username/password/host are wrong or are missing, all the Sample test cases will fail. If the FTP username/password/port are wrong or are missing, the tests that requires file transfer to uCPE Manager will fail. Ansible logs are not written into the log/ansible.log file when the stdout_callback is set to selective in the ansible.cfg. For debugging, check the python logs from log/debug.log file or change the stdout_callback to debug and rerun the test.