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I would in future tend to trust sources closer to being official rather than someone on a forum. Remove the extra * so its just Disallow: /*? You can find more info here - https://support.google.com/webmasters/answer/156449 You can also test your robots in your webmaster tools so don't forget to give that a go if in doubt. Hope that helps.

I think you should be rewrite your dynamic url will be good for SEO point of view. Thanks, Akhilesh

Hi, If the duplicated content urls are already in the google index then excluding them with the robots.txt will not remove them but just stop the google bot from crawling them again. You could do a bit of conditional logic on your head.phtml template file to check for the relevant url part and output a noindex,follow meta tag on the pages you don't want indexed. This is a more reliable way to make sure they are removed and not indexed in the future (be sure to test first!).

You're welcome. Good luck and you know where to find me if you have any additional questions -Andy

Glad to hear it and do post again with any additional questions -Andy