No trusted error for Android 7.1.1 below

Welcome @meteoguzhan

If you provide your actual domain name we could say for sure.

But, your server is likely sending out the "short chain" and not the default "long chain" needed for older Android compatibility.

See this topic for more details

If you need help configuring your acme client and/or server for this please complete the questions from the form as best you can


Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. |, so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:

It produced this output:

My web server is (include version):

The operating system my web server runs on is (include version):

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):