Noindex Nofollow from similar sites

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I have two equal sites, same content, design, everything (One is homologation the other production). They are in different domains, only thing that changes, it is in the Robots that one is indexed index follow, and the other is noindex nofollow, I wonder if I will have duplicate content problem with these sites?

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Making a response update.

There is one more way to make the block that would be straight through HTTP response header using the X-Robots-Tag

Instead of a metatag or robots.txt, you can also return a header X-Robots-Tag:noindex in response to a page request. Here is an example of an HTTP response with a X-Robots-Tag that instructs trackers not to index a page:

HTTP/1.1 200 OK
Date: Tue, 25 May 2010 21:42:43 GMT
(…)
X-Robots-Tag: googlebot: nofollow
X-Robots-Tag: otherbot: noindex, nofollow
(…)

Here is more information about X-Robots-Tag: https://developers.google.com/search/reference/robots_meta_tag

Another tip about the tags <meta> is that you can block by them specific bots like for example:

<meta name="googlebot" content="NOINDEX, NOFOLLOW">
<meta name="MSNBot" content="NOINDEX, NOFOLLOW">

Blockade by robots.txt of the site you do not want to be indexed:

User-agent: *
Disallow: /

In the User-agent: * the * means that this section applies to all robots.

And the Disallow: / tells the robot not to visit any page on the site.

Another thing, the Noindex Nofollow should be inserted in a meta tag <meta> not within the robots.txt! The right thing should be:

<html>
<head>
<title>...</title>
<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">
</head>

Either way the tag <meta> can be ignored by some search engines, as well as the robots.txt especially malware-robots. And the nofollow only blocks links from the page you are on, if there is a link to your site on some other page that does not also have the nofollow the bot can find your site by this link, whether or not having the robots.

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