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?

Thanks.
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