DHCP doesn´t work to acquire IP adress via Airport

Some words to my wireless configuration. My WLAN AP is an AVM FritzBox WLAN 7050 with internal DHCP services disabled. DHCP services in the 192.168.9.0 network are provided by a Linux Server on 192.168.9.1 (range 192.168.9.200-254). Windows WLAN clients haven´t any problems to connect to the AP and get their IP from the linux dhcp server.
I can use the assistent to get access to the network. There are two stages, the first where i had to search for WLAN AP´s (which shows me the AVM box) and then provide the WPA2 password. This works and the connection to the WLAN AP is established. The next step is the connect to network button. Pressing this button the first time, i get a message that no connection to the network could be established. Pressing the button a second time gives me a connection and an IP from the range 192.168.9.200-254 is correctly assigned as well as the router adress (which is 192.168.9.99),
I know can use the WLAN network until i decided to shutdown Mac OS X and reboot. When i know restart the laptop, no connection to the network could be established. The DHCP server logfile on my linux box doesn´t show any DHCP requests during the boot phase. The airport connection tab shows "a private adress is assigned to the adapter and a network connection may not be possible ". When i go the the network connection tab, i see that for the airport adapter, the adress is 169.something. I can press the "renew dhcp release" button is often as possible, nothing happens and no log entries shows up on my dhcp server.
The only thing i can do to get a working network connection is to start the assistent again, which is very annoying.
How can i solve the problem?
Macbook Pro Mac OS X (10.4.6)

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