Fedora 17 NIC is disabled automatically

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http://forums.fedoraforum.org – Using fedora 17 for critical application in the organization. But if due to any reason the network cable is removed then NIC is getting disabled automatically. If I am connecting back the network cable still automatically it is not coming up. I need to go to the network menu option and manually I need to make it on. then only it is working. What is the remedy? (HowTos)