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A Drupal site that works fine for regular users returns a 404 not found error when I try to use the W3C validator on it; it is also not being indexed by Google at all (which is the main issue but I suspect there is a connection). It is a https:// site with .htaccess rule to redirect any http:// request to the https://.

I had had it running in Google webmaster tools and thought it was fine, but it turns out I had not added the HTTPS domain. After adding the HTTPS domain it's also returning the header as

HTTP/1.1 404 Not Found
Date: Mon, 15 Oct 2012 19:37:43 GMT
Server: Apache
Expires: Sun, 19 Nov 1978 05:00:00 GMT
Cache-Control: no-cache, must-revalidate, post-check=0, pre-check=0

Robots.txt just has

User-agent: *
Crawl-delay: 10
# Files
Disallow: /cron.php

How can I check what the issue is here?

share|improve this question
Did you find why the validator got a 404? – j0k Oct 15 '12 at 21:19
i had only http in gwt. with https it also shows the 404 header.. no idea why – Damon Oct 15 '12 at 21:24
I mean, did you try to find, on the server side, why is there this 404? In apache log for example, by enabling more rewrite level log, etc .. – j0k Oct 15 '12 at 21:28
No idea.. :/ could you elaborate a bit on what methods I might try? I'm usually more just doing development – Damon Oct 16 '12 at 0:24
Possibly unrelated, but have you looked at your portfolio site with Googlebot user-agent? – GDav Oct 16 '12 at 8:22

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