I did exactly that, but when I open the report and get to the screen where to select the input parameters, and click view report, I get a screen that reads:
The report you requested requires further information.
And shows all the fields to provide the database server info.
This error might nothing to do with the fact that your report is using a linked server. Please make sure that your Crystal report is using Microsoft OLE DB Provider for SQL Server. http://www.reportportal.com/help/crystal/example.htm
Which authentication type are you using for your linked server: Windows or SQL Server?