"Error: connection activation failed: Device not managed by NetworkManager or unavailable" after moving machine

[Rick Stevens]

On 09/06/2013 09:54 AM, Aaron Gray issued this missive:
> Thanks. It turns out that the mistake was mine and I had the wrong
> device plugged in ! Very sorry for the noise :(

No worries. I'm pleased that you got it sorted out.

>
> On 4 September 2013 17:34, Rick Stevens <ricks at alldigital.com> wrote:
>> On 09/03/2013 03:01 PM, Aaron Gray issued this missive:
>>
>>> Hi,
>>>
>>> "Error: connection activation failed: Device not managed by
>>> NetworkManager or unavailable"
>>>
>>> I am getting the above error and have tried all my normal mods to try
>>> and get a connection.
>>>
>>> I did move the SATA drive from one machine to another and back,
>>> changing the MAC address and putting it back in the process.
>>>
>>> I have tried adding 'NM_CONTROLLED="yes"' to
>>> /etc/sysconfig/network-scripts/ifcfg-em1
>>>
>>> but still am not able to get it to work.
>>>
>>> As I cannot connect to the internet on this device I cannot do any yum
>>> reinstalls.
>>
>>
>> Are you certain the device is still called "em1"? As root, try "ifconfig
>> -a".
>>
>> Several revisions ago many network devices were renamed based on the
>> bus they were on and where they appeared on the bus. For example, my
>> old "eth0" got renamed "p4p1". My "wlan0" card was also a candidate,
>> so I added a rule to "/etc/udev/rules.d/70-persistent-net.rules" to
>> keep the old "wlan0" name. The rule looks like:
>>
>> # PCI device 0x8086:0x008a (iwlagn)
>> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
>> ATTR{address}=="bc:77:37:51:11:5c", ATTR{dev_id}=="0x0", ATTR{type}=="1",
>> KERNEL=="wlan*", NAME="wlan0"
>>
>> You could do something similar. Note that the "bc:77:37:51:11:5c"
>> is the MAC address of my wireless card. You can extract that from the
>> "ifconfig -a" data...it's the thing listed after "ether" in the listing.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital    ricks at alldigital.com -
- AIM/Skype: therps2        ICQ: 22643734            Yahoo: origrps2 -
-                                                                    -
-           Give me ambiguity or give me something else!             -
----------------------------------------------------------------------