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I got problems connecting my iMac to the internet (Wifi). Signal is fine, all other machines (iPad, win pc and macbook pro connect just fine).

read several posts about that issue but couldnt figure out anything.

i just found this suggestion:

"config t firewall amsdu" http://community.arubanetworks.com/t5/802-11-Client-Device/New-iMac-802-11n-issues/m-p/14505#M283

where do I use that commands or do you guys know any other solutions?

E: just read about 2,4ghz routers and bluetoth issues. when BT turned off the internet works again, but very, very slow. maybe another issue?

best regards, Alex

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What exactly is the problem? Does the machine see the network, but doesn't connect to it? Does it give any error? (Because sometimes the network isn't even shown in the network list despite of good signal, ...) –  Mahm00d Jun 23 '13 at 15:53
    
First step would be to "neutralize" all settings (temporarily.) Turn off Firewall, for example. Cofirm that iMac can connect with Ethernet. Then add the details requested above this could be an easy fix, it's just narrowing it down. –  Zo219 Jun 25 '13 at 1:49

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