Can't connect to router / Error says router uses ACLs which it doesn't

Hi!
I'm having troubles connecting my MacBook (10.4.10) to my WLAN-Router (Siemens Gigaset SE551).
I switched from WEP to WPA encryption today and all windows machines work just fine, however my MacBook refuses to connect.
The dialog says:
"The selected network uses an Access Control List to restrict access and this computer is not in the list.".
This is wrong. MAC Filtering is not enabled and the MacBook connects flawlessly using Bootcamp.
I already tried to clean up my network settings (no default entries, etc.) and updated the routers firmware. Nothing works.
Any ideas?
bye
PhilPhil
MacBook Mac OS X (10.4.10) Airport, Siemens Gigaset, SE551, WPA, MAC, ACL
MacBook   Mac OS X (10.4.10)  

It works under Bootcamp, so the router settings can't be the problem, right?
Well, no, Macs & Routers don't exactly agree on "standards", and most likely everybody's Router was tested or fixed to work with Windows® "standards"!
Yet I don't "think' that were the problem is yet. Most referemces to SSIDs are kept either in Keychain, or...
/Users/nnnn/Library/Preferences/com.apple.internetconnect.plist
/Library/Preferences/SystemConfiguration/preferences.plist
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist
With cross references used between them too!
Crazy Idea®... maybe try enabling ACL on the Router as a test with the mac's MAC in it?

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