The site was coded in asp (with most of the code written in the early 2000's). It was hosted on an old pentium 2 with windows 2000 server until the server died in 2012, it was then replaced by a "new" one running windows server 2012. Unfortunately, because of lack of time, we never really update the site during the past 10/15 years. I tried to apply the regular microsoft patches when available (I don't think they still support 2012 server anymore btw), but there were probably lot of security issues with the way the site itself was built/coded, I guess it was not a concern back then in 2000, it certainly is now. There were probably also issues with the sql server database. I don't really know and I don't really have time to investigate (and to answer a previous post, I have no idea how it was hacked), and to be frank I am not really that interested in trying to fix 25 year old asp code. Olivier is in touch with some people who may or may not help to rebuild the thing from scratch, that will probably take forever (if it happens), in the meantime, I should probably redirect each url of the site to archive.org (until someone hacks the server again and kills the redirections).