So I bought a Comodo SSL from Namecheap and put my site up on a Ubuntu droplet on DigitalOcean on a nginx server.

My default virtual host file on /etc/nginx/sites-available/:

server {
       listen         80;
       server_name    www.navarra-rpg.com;
       return         301 https://www.----------.com$request_uri;

server {

    listen 443 ssl;

    root /var/www/--------.com/html;
    index index.html index.htm;

    ssl_certificate /etc/nginx/ssl/ssl-bundle.crt;
    ssl_certificate_key /etc/nginx/ssl/---------.key;

    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

    ssl_prefer_server_ciphers on;
    ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;

    server_name www.navarra-rpg.com;

    location / {
        try_files $uri $uri/ =404;

Here are the four files I recieved:

  • AddTrustExternalCARoot.crt
  • COMODORSAAddTrustCA.crt
  • COMODORSADomainValidationSecureServerCA.crt
  • navarra-rpg_com.crt

Of course, I then used the command to bundle them all up nicely to get the bundled certificate plus the key when I used the openssl req command.

Now, when I go to DigiCert's site to test and I type in my address... it says that I installed it correctly.

I checked out my cert installation to make sure I got the chain right:

  • Comodo RSA Certification Authority
    • Comodo RSA Domain Validation Secure Server CA
      • ----------.com

I used the following command from this guide to get the ssl bundle cert.:

cat ---------_com.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.crt AddTrustExternalCARoot.crt > ssl-bundle.crt

Why isn't my website showing up securely on my Android mobile but is on my desktop?

I get NET::ERR_CERT_AUTHORITY_INVALID error on my phone along with upon pressing the NET:ERR_CERT_AUTHORITY_INVALID error

  • which android verison? Also you should look to remove SSLv3 support this is widely considered insecure. – Oneiroi Jun 18 '15 at 14:01
  • @Oneiroi Will be sure to do that. Which android? Latest version. I Am on Samsung Galaxy S6... >_< – Gao Lin Jun 18 '15 at 14:03
  • Ok we can assume Android 5.x in this case; and if you go to navarra-rpg.com via youy Android what do you see in the browser? any indicators as to the error would be helpful (screenshot would be ideal) – Oneiroi Jun 18 '15 at 14:16
  • @Oneiroi I added in my mobile error on the original post. – Gao Lin Jun 18 '15 at 14:26

You can find some more information by "tapping" NET::ERR_CERT_AUTHORITY_INVALID on the first page see this example here: https://www.youtube.com/watch?v=o8iJE7p-W4M

In short NET::ERR_CERT_AUTHORITY_INVALID indicates the certificate authority is not trusted by your Android device.

Try opening a support case with the CA (Comodo), a quick google seems this is not an uncommon issue for comodo certs.

Check https://stackoverflow.com/questions/11340298/certificate-trusted-on-pc-but-not-in-android

Also for secure SSL nginx configuration refer to: https://wiki.mozilla.org/Security/Server_Side_TLS

  • 1
    It worked. :) I got a cert from Comodo and it was all good. – Gao Lin Jun 18 '15 at 20:28
  • +1 for security link that also helps with performance. – Marcelo Agimóvel Nov 24 '18 at 13:10

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