[:en]On SQL Server Reporting Services client side printing[:]

[:en]To use client side printing an activeX control is required. It needs to be installed with administrative priviliges.

Here is a good how-to:
http://www.kodyaz.com/articles/client-side-printing-silent-deployment-of-rsclientPrint.aspx

If security restrictions prevent an installation you may disable client side printing e.g. via SSMS, connect to reporting Services, Properties->Other->Advanced->EnableClientPrinting

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