Access to the requested URL was blocked

While trying to access the URL:
/index.php?view=article&catid=19:aktuelles-2014-bis-2020&id=317:neue-projekte-1-projektaufruf&format=pdf
The content is blocked for the following condition:
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Additional information:
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ZgVRnuWgfjhSQJJlwplLogAAAAU
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