The Monash WWWJDIC server is back now.
Although I was able to clear the initial problem with the security
people there, they ran a test over the site which pinged several
executable program files as "high probability of being malicious".
They were all small utilities written in C and quite harmless. The
common element was that they'd all been compiled some years ago. The
problem went away when I recompiled them. I think the (commercial)
security scanning software, which uses machine learning, had probably
been trained on programs that had been compiled around the same time
and was picking up the signature of various library routines. All a
bit creepy.
Cheers