I have read PHP bugs (I wish I could find them again....) that even if the SOAP connection is using a given auth, the WSDL file can not be fetched using the same auth.

Currently, even with your library, I'm having to manually download my WSDL files from my Navision 2013 R2 instance, and point the SoapClient at the filesystem instead of the URL. Is there a workaround for this with your library?