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We have one domain and one sub-domain. Until last week both of them appear in first page of Google search for very important keyword. Unfortunately Google dropped our main domain from search results. our main site has been in first page for 5 years!

About one year ago we build this sub-domain. It simply has been redirected to one of pages of main domain.

For solving problem we upload a independent site for sub-domain because we guessed that Google think this is our main page of our site. But problem did not solved.

What should we do? our main site offer main services and we we want that will be on first page.

Shout down sub-domain? Redirect to main site? Put the link of our main site in sub-domain? (About one year ago we put link of this sub-domain to our main site. Google indexed it and continuously bring that to top.) changing in robots.txt ....

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    Does the subdomain contain the same content, different content, or similar content to the main domain? – John Conde Apr 27 '14 at 16:30
  • What was the purpose of the sub-domain? Is it still needed? – closetnoc Apr 27 '14 at 16:32
  • @JohnConde both of them have similar content but not same content. The sub-domain only has one page and sort of advertising content that bring customers to main services. – Hamedb Apr 27 '14 at 16:46
  • @closetnoc we also need that subdomain because of advertising content and other pupolar keyword. problem is that overall search appearence of subdomain is better now! – Hamedb Apr 27 '14 at 16:50
  • How is it different from the parent domain name content? – closetnoc Apr 27 '14 at 17:20
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The demotion of your home page for a specific keyword can be due to link building using that keyword as anchor text and keyword stuffing. This type of "overoptimization penalty" can cause another page on your site to show up in the search results (but usually lower).

Reference: A close look at what over optimization really is Google SEO News and Discussion forum at WebmasterWorld

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