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I'm getting this error while bringing up my network card:

(process:2550): WARNING **: _nm_object_get_property: Error getting 'State' for /org/freedesktop/NetworkManager/ActiveConnection/3: (19) Method "Get" with signature "ss" on interface "org.freedesktop.DBus.Properties" doesn't exist

I'm using the following commands:

1. ifup eth1
2. /etc/init.d/network restart

I have installed a fresh copy of Centos 6.2 and configured the network card.

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The error message refers to NetworkManager while the commands you use are the older plain network service commands. Are you using the NetworkManager service or the plain network service? check /sbin/chkconfig --list network and /sbin/chkconfig --list NetworkManager. Also please add what user account is used to execute these commands. – Bram Jun 3 '12 at 8:25
yeah i've checked NetworkManager services are off....this message appears while NetworkManager service are up while i'm bringing up my eth1 but i have disabled services #chkconfig --level 35 Networkmanager off and i am trying to activate my eth1 card without NetworkManager...i have made changes in ifcfg-eth1 file... nm_CONTROLLED="no" when NetworkManager services are off i don't see network notification icon on and if i go to system > preferance > network connection i don't see system eth0 or eth1 in wired tab.........Am i missing any step plz help me out to bring up eth1 – mhay Jun 17 '12 at 17:29
Please post the contents of /etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-eth1 – dotplus Jul 20 '12 at 4:46
mhay, note there's a difference beween nm_CONTROLLED="no" and NM_CONTROLLED="no". Only the latter will work, while you say you've done the former. If you do ever revisit SF, please post the contents of the files, as dotplus requests, above. – MadHatter Jan 2 '14 at 10:54

Either you have deleted the network Manager properties in the script written for bringing up the network interface, or network manager is not installed correctly or corrupted.

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The OP is pretty clear that he's not trying to use NetworkManager to manage this interface at all, so that's probably not it. – MadHatter Jan 2 '14 at 10:53

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