If you upload your application you need to set the connection in the _lib. Overlooked is an error in the settings preventing the working of generation of pdf files like in export as pdf from a grid. In my case
C:\aducom\Coral\UniServer\vhosts\xxx\ont_0_2_lib/tmp
needed to be changed to
C:\aducom\Coral\UniServer\vhosts\xxx\ont_0_2_lib mp
look at: / needs to become a \
after this change, I could generate and export pdf files.
This counts for a Windows 2008 server installation by the way.