Ive personally installed easynet on 3 different amiga, with 3 different setups. A1200 with PCMCIA network, cabled thoug, maybe you should try that. As I never got a wireless to work. Also on an A4k with XSurf and on an A2K with hydranet, and they all work flawlessly.
I dont know if you use DHCP, but if you do, try using a static IP instead.