wireless connection but network not working

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http://forums.fedoraforum.org – I'm trying to connect to wireless connection with networkmanager. The networkmanager reports that the wireless is connected. Ipconfig reports after the connection that the correct IP and gateway are set. But i can't access the network. Ping can't even connect the gateway. I don't see any error o warning messages neither in dmesg or in /var/log/messages. Using windows 7 i have problems at first until I realise that I have to set TKIP instead of AES in the configuration of the connection. I didn't find any option to do this in the networkmanager, but the logs in wpa_supplicant.log shows that T (HowTos)