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How to disable NetworkManager in RHEL?

Solution Verified - Updated 2018-01-03T15:39:11+00:00 -

Issue

Disabling NetworkManager
- What steps are needed to disable the NetworkManager service?
- What is needed to ensure it does not start again on a subsequent reboot?
Disabled NetworkManager but still seeing errors (need to fully disable)
- Trouble configuring networking with NetworkManager and need to disable.
- Disabled NetworkManager but still seeing errors about it and "Connection activation failed"

Environment

Red Hat Enterprise Linux (RHEL) 5.
Red Hat Enterprise Linux (RHEL) 6.
Red Hat Enterprise Linux (RHEL) 7.
NetworkManager service.

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