Problem with validation URL

Following the instructions given on this page

http://jigsaw.w3.org/css-validator/validator?uri=jlbradley.home.att.net%2FLANCE3.HTM&warning=1&profile=css2
I added this URL
	http://jigsaw.w3.org/css-validator/check/referer
to the [successfully validated] underlying page.  Clicking on the
resulting link at the bottom that page
	http://jlbradley.home.att.net/LANCE3.HTM
a few minutes ago returned this error
|    Invalid URL
|    The URL http://jigsaw.w3.org/css-validator/check/referer 
|    that you requested is not available  on that server.
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Received on Wednesday, 4 July 2001 11:26:44 UTC