On 08/07/2014 10:56 AM, mcclnx mcc wrote:

We just got DELL R920 and installed Centos 6.5 on it. After installation, network not function. We manually enter IP address, gateway and netmark on "em1".

we also do following:

1. startup NetworkManager
2. /etc/sysconfig/network-scripts/ifcfg-em1 ==> NM_CONTROOLED=yes

I tried to startup network and get error message:

Bring up interface em1: connection activation failed Device not managed by NetworkManager or unavailable.

Any ideal?

You have a typo in the option you state in your 2. Fix it.

Also, how are you manually entering the ip/gateway and netmask? Are you putting them in the config as well?

It would help to see the config to know where you might have mistakes.