Is the dll in the published folder. Yes. Or do you need to copy it in from the main 3dgs folder. Stupid questions I know. But simple first.
There is a way to make the engine write a log.. You should look into that in the manual. Why am I not just telling how, well I've never done it.

Edit - run from shortcut with the command line(I think)
-diag
Writes diagnostic messages into a file in the current folder. In server mode (-sv ) the filename is acklog_sv.txt; in client mode (-cl ) the filename is acklog_cl.txt; otherwise it's acklog.txt. When starting in dedicated server mode (-sv), the -diag output is additionally printed into the server console window. This way it's possible to observe on the server which clients connect or leave, and what's happening in the game. Write access rights to the current folder are required; under Vista or above, the engine or application can be run as administrator for writing into a program folder.

-dir name