try to install some app that block`s data connections from your mobile provider ... nodata for example, you can find a link to it on xda.
set all the other connections to disabled ... and you phone connection to GSM ... not GPRS, EDGE or something else ...
set your wi-fi connection to connect to the internet ... not to work.
this worked for me for a dlink 784 router, now i`m banging my head against a 524 (again DLink) and have the same problem it connects but does not get on the internet. the problem seems to come from the TP, some settings need adjusting but i didnt figure out which one yet ...
PS: for iko, i think you have your router set on enteprise security, not personal... for personal WPA, WPA2 with a PSK, and TKIP or AES encryption, the "use IEEE 802.1X Network Access Control" is checked and greyed out, and you do not have access to it on the TP