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. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is: dksti.com
I ran this command: https://dksti.com/ap/hello (from an Android app on mobile phone, not from a browser - it works fine from a browser, even from an Android phone).
It produced this output: Exception Message: “The SSL connection could not be established, see inner exception.”
Inner Exception Message: “Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED\n at /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/boringssl/ssl/handshake_client.c:1132”
My web server is (include version): nginx/1.10.3 (Ubuntu)
The operating system my web server runs on is (include version): Ubunti 16.04 LTS
My hosting provider, if applicable, is: Microsoft Azure
I can login to a root shell on my machine (yes or no, or I don’t know): yes
I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no
The version of my client is (e.g. output of
certbot --version or
certbot-auto --version if you’re using Certbot): certbot 0.27.0
This seems to have started yesterday. Android apps (build using Xamarin) which used to have no problem are suddenly encountering the SSL failure. These are existing, unchanged apps. Nor has the server changed. The same mobile devices can access the same URL using a browser without difficulties. The equivalent iPhone apps work as well, only Android apps are experiencing sudden SSL failures.