Hello Yannick
I have just installed 4seo on my site www.xxxx.com and I have fallen at the first hurdle. The site analysis is stuck at 0% and I am getting a 403 error on the homepage. I think that this might have something to do with a rule in the robots.txt file. From memory my host company put in a number of lines in the robots.txt a few years ago because I was getting a lot of bots visiting the site and eating up the resources. I used to use Jsitemap on this site to create a sitemap, but it is not playing nicely with a component I use called JomHoliday. So that is why I have switched to 4SEO (plus it makes sense given I have used sh404sef for years).
Site details & login
https://www.xxxx.com/administrator/
user: xxxx
pass: xxxx
Thanks
Iain Laverock