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If you try to validate this page: http://jubin.altervista.org/clienti/air/login2.php the validator tries to validate a blank page (as you can see by enabling "Show Source" option). If you open the given URL with a browser, the page is correctly displayed (is a normal HTML page with nothing of strange in it). The validator works correctly with all other pages of my site (so no my server problem)
I get this: % netc jubin.altervista.org 80 GET /clienti/air/login2.php HTTP/1.1 Host: jubin.altervista.org User-Agent: W3C-Validator/libwww-perl HTTP/1.1 200 OK Date: Tue, 05 Apr 2005 17:55:30 GMT Server: Apache Connection: close Transfer-Encoding: chunked Content-Type: text/html 0 Which is indeed an empty document. If this is not caused by login2.php you should contact the server administrator to take care of this issue. It's not a problem with the Validator.