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Hello,
it is possible that Google is blocking you because you have sent to many queries. If you are using version 6 of Ranking Toolbox, there is the option "Engine Friendly Mode" in Query Settings. In this mode the number of threads cannot exceed 2 and the maximum number of matches is limited to 50 entries. The process of query is intentionally slowdown in order to not harm the engines and make the query more similar to human input. Using this mode may prevent blocking your IP address by some search engines after massive querying.
Best regards
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