Problems with a wap application

Question

I have developed a wap application using .net. I have tested the application on my computer and runs correctly. Problems started when I installed it on server. Surfing with IE or Mozilla Firefox runs correctly but surfing with different cell-phones(S55, C55, ME45) appears this error "Error HTTP: 403 forbbiden" Only the application runs correctly, Sony Ericsson Z600. Windows 2000 Server and Framework 1.1 are installed. Thank you very much. -------------------------------------------------- Imagine, design and develop. You can do it.