An update here. I noticed the post approval and reply speed on this forum is understandably rather slow, but also noticed that some other posts asking for similar help are still unanswered even after months.
So for anyone in a similar case, I went ahead and dug into audit.config myself, using the following page as a guideline to understand what the parameters meant:
viewtopic.php?f=6&t=1393&start=0The parameters in audit.config were, no surprise, were incorrectly set, but after some modifications, eventually the script ran, properly sending the data to the OA server, and the server properly registering and showing the audited linux machine.
From all of this I have a suggestion to OpenAudIT developers, these would be feature requests I guess:
1) When clicking on Administration->Audit this Computer, it shouldn't download the .vbs script blindly. If the requesting user is on a browser running on a linux machine, that won't make any sense (or will it?) It should rather download both audit_linux.sh AND audit.config, or at least the page could prompt the user to let it download either the windows or the linux scripts/files.
2) After installing OpenAudit, the audit.config file could be left properly configured automatically, so that a linux audit could run right out of the box with no manual intervention needed on those files.