I’m trying to add a certificate to my ec2 instance using the default domain (see below). I selected zerossl.com as CA because my only purpose is to learn the business and I don’t want to invest money for now.
When I reach the verification step I didn’t manage to complete it. I tried both Email Verification and HTTP File Upload.
Using Email Verification, I don’t receive the email at my side, nothing at the mail.log. Emails from other sources (private laptop, Gmail) work.
Using HTTP File Upload, I download their txt file and upload it to my server. I checked it with my browser and with Postman and it works (getting the info) while their verification filed.
What do I miss?
My domain is:
My web server is (include version):
Nginx version: nginx/1.14.0 (Ubuntu)
The operating system my web server runs on is (include version):
Ubuntu 18.04.5 LTS (on EC2)