Fortinet Forum
The Forums are a place to find answers on a range of Fortinet products from peers and product experts.
New Contributor

FortiWeb & Let's Encrypt


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 [AA.BB.CC.DD]: 404


I figured out that the same log is on my internal WEB servers:


2021-10-21 10:56:09 GET /.well-known/acme-challenge/AgFHf9h8EJ74tf3u80DfkZ8c24reLuAUbCS5lhnNhAg - 4016 - Mozilla/5.0+(compatible;+Let's+Encrypt+validation+server;++[link][/link] 404 0 0 22


so my conclusion is that fortiweb pass the request from to internal servers instead of processing it.


This behavior is not present with my test/demo 400D appliance.

Any ideas how to solve it?