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If you are using Red Hat (or something derived from it, like Centos or Scientific Linux) you can install the policycoreutils-python and setroubleshoot-server packages with yum, which will give you some powerful diagnostic tools.
From the sounds of it, and without knowing your distribution details, you probably need to set the selinux context on the file ...
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Even if you managed to get NetworkManager to change the ethernet address of your wifi card, it's not lost: it's stored in some ROM in the NIC.
To retrieve the original address without having to reload the kernel module or reboot, while keeping NetworkManager out of it, you can use the command ethtool (from package of the same name). The NIC driver has to ...
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