Fresh installation doesn't work out

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http://forums.fedoraforum.org – hi, I test 3 servers with Fedora 7-> 9 no problems Any Fedoracore from 10 -> 12 I have some problemes with internet access I can sometimes access internet, sometimes I can't ( ..... with a fresh installation ) A yum update doesn't work either... What's wrong ? Any idea ??? ( I am also using Centos and Ubuntu ( sorry about that) but everything is working fine except Fedoracore ?!?! I made minimum 3 installations on each machine... same result Is there a bug ? Something to change ? Thanks for your help Steve76 (HowTos)