on the site outages of the past few days
It turns out that the server which is hosting calcudoku.org has been under "denial of service" attacks
during the past few days.
(see
https://en.wikipedia.org/wiki/Denial-of-service_attack)
Note that the server hosts 220+ web sites (!), so I have no idea which site provoked somebody's anger
such that he or she would want to destroy it.
Together with the system administrator I've put some measures into place to reduce the effect, but I'm
not sure how long this will help.
I probably should finally move it to a separate server, the risks of having it on one with many sites are too great :-(
Patrick