IIB: "Unsupported Method: GET" for WSDL even if "Enable support for ?wsdl" is true

Are you trying to get the WSDL for your service using the traditional http://server:port/path/to/service?wsdl, making sure that you checked the "Enable support for ?wsdl" option and get just a plain "Unsupported Method: GET." message?

Look again your "Path suffix for URL" and check if it has the leading slash (/)

:)