My thought was; adding a logfile to our software within half an hour should be doable. So let's give it a shot!
The server has a debug macro. So obviously it'd be easiest to add it there. The macro expands to a call to a singleton, which emits a Qt signal. It's caught by a class which, amongst others, writes this stuff to the screen.
That was the first idea, but it turns out someone already made a start using syslog. Before the signal is emitted, I also added a line to write it to syslog.
Update: turns out that's a little shortsighted. I'd like to coin a new law that states that there's always more work involved than you think: