Crystal Login Failed MS SQL only on some machines

Crystal fails with CrystalDecisions.CrystalReports.Engine.LogOnException: Database logon failed. ---> System.Runtime.InteropServices.COMException (0x8004100F): Database logon failed. but only on one certain machine. I searched thousands of hits for this error and never found any answer.
tsofkaAsked:
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tsofkaAuthor Commented:
The Crystal report failed with CrystalDecisions.CrystalReports.Engine.LogOnException: Database logon failed. ---> System.Runtime.InteropServices.COMException (0x8004100F): Database logon failed. because the MS SQL Native Client was not installed. The SQL native client is not a dependency for the Crystal Merge modules and the Setup project will not ever add it. Crystal will not throw a "dll not found". Get the sqlncli.msi and install it separately.
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