If you recently installed CentOS 6+ (Desktop) and if your Ethernet connections are showing up but not working, and getting this error”_nm_object_get_property: error getting ‘State’ for /org/freedesktop/NetworkManager/ActiveConnection/3: (19),”then follow the instructions below to correct the problem.First login to the machine directly as root or as a privileged user.1. Disable NetworkManager by running ‘service NetworkManager stop.’2. Enable network by running ‘service network start.’Now, check your internet connection by opening a well known website on the browser or try grabbing a random web page by running ‘wget domain.tld’ on command line or better yet, try updating your system by running ‘yum -y update.’Caution. Before running ‘yum -y update,’ make sure you have enabled/disabled needed/unwanted repositories. For more on repos, please visit, repos in CentOS.