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Message: <blockquote data-quote="maxymina" data-source="post: 1644827" data-attributes="member: 345760">Hi there,i just got myself around updating my imac to yosemite and now my computer does not obtain an ip address from my airport express. it sees the airport express but does not get an ip. when i go to the assistant it asks me to turn off the airport express and restart it. then the computer can get the ip address and works again. however, if i put the desktop to sleep, upon waking it up the same problem appears: it cannot get the ip from the airport express.I have 2 other computers (macbooks) running yosemite and an ipad, i also have an android phone and these devices have no problem with the aiport express. so the problem is something that got modified/didn't get modified in this particular desktop during the upgrade to yosemite.I would appreciate any suggestions. Thank you very much in advance.</blockquote>