I have to implement Let's Encrypt certificates on my fortiweb 400E appliance.
For test purposes I managed to achieve it on my demo/test FortiWeb 400D, everything is fine.
On my production 400E I constantly get error logs :
Let's Encrypt failed to issue certificate due to error. type: urn:ietf:params:acme:error:unauthorized, detail: Invalid response from https://mydomain.com:443/...Z8c24reLuAUbCS5lhnNhAg [AA.BB.CC.DD]: 404
I figured out that the same log is on my internal WEB servers:
2021-10-21 10:56:09 10.21.100.63 GET /.well-known/acme-challenge/AgFHf9h8EJ74tf3u80DfkZ8c24reLuAUbCS5lhnNhAg - 4016 - 10.21.102.43 Mozilla/5.0+(compatible;+Let's+Encrypt+validation+server;++[link]https://www.letsencrypt.org)[/link] http://mydomain.com/.well...Z8c24reLuAUbCS5lhnNhAg 404 0 0 22
so my conclusion is that fortiweb pass the request from letsencrypt.org to internal servers instead of processing it.
This behavior is not present with my test/demo 400D appliance.
Any ideas how to solve it?