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Some web servers send wrong status codes. When a search engine spider requests a web page from your site then your server sends a response code. This should be the “200 OK” code.

Unfortunately, some servers send a “302 moved” or even a “404 not found” response code to the search engine spiders although the web page can be displayed in a normal web browser.

In that case, search engines will think that the web page doesn’t exist and they won’t index the page.

Solution: Use the search engine spider simulator to find out which response code your web server returns to search engines.