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Any attempt to validate CSS on any page is failing as of the moment. See URL field for one example. I've tried this with a variety of sites, all of which can be reached directly from here, and all of which can also be reached by the W3C HTML validator.
Works ok currently, probably it was a temporary problem somewhere.
It seems that the server is having some network (routing, probably) issues, and cannot access some sites, although others are fine. I am following up with the systems team.
Thanks. Note that I just checked it against the w3.org index page, which seemed a sure bet to work, and that failed as well -- just in case that's any help with diagnosis.
Fixed for the moment, although in the longer term, a new server will be built and will replace the exisiting one...