"The page you are looking for cannot be displayed because the page address is incorrect. "

Hi, I'm trying to post from an asp page to a php and I get this error: The page you are looking for cannot be displayed because the page address is incorrect. then later on in the same page I get the error: http 405 resource not allowed internet information services. I have no experience with php so any advice on what is causing this would be greatly appreciated (and please excuse any bone-head mistakes). Both pages reside in the same directory. Thanks, AC