validating page with invalid ssl certificate

Hi,
     I'm having problems validating a project in development. The page 
in question is hosted on a development server server http over ssl. The 
server currently does not have a valid certificate. When trying to 
validate the page we get:

I/O Error: sun.security.validator.ValidatorException: PKIX path building 
failed: sun.security.provider.certpath.SunCertPathBuilderException: 
unable to find valid certification path to requested target

Is this really necessary, surely the validity ofan ssl certificate is a 
moot point to a css validator? It's worth noting that the html 
validation service on the w3c happily validates the same url.

yours
     Paul

-- 
Paul Hayes
Software Developer

Plug-in Media Ltd
www.pluginmedia.net
t: +44 (0)1273 783794
http://twitter.com/pluginmedia