Why is my SSL certificate untrusted on Android?

user1420752 asked:

The SSL certificate is trusted on most Desktop computers, but only some Android devices. However, even on Android devices where the certificate is untrusted, the root certificate is installed.

I must have tried a hundered ways of resolving this problem, but I think it has something to do with the AddTrust External CA Root (perhaps to do with the SHA-256 fingerprint, which is missing?).

  • The cause does not appear to be an incorrect Certificate Authority Bundle.
  • The cause does not appear to be related to time.
  • All online SSL checker tools I’ve used (e.g., https://www.ssllabs.com) say the SSL certificate is installed correctly.
  • The root certificate is located on my Android device and on my Desktop computer (see the SHA1 fingerprint in the two screenshots, which is identical).

The root certificate is installed on the Android.
The root certificate is installed on my Desktop.

EDIT 1

I believe I have included the new intermediary certificate in my certificate chain, but SSL labs is still reporting that it’s not present (even after clicking the “Clear cache” button).

Browser refresh includes new SSL certificate chain.
SSLLabs refresh does not see the new SSL certificate chain.

EDIT 2

To be explicit about what I’ve done:

  1. I’ve signed into to WHM and clicked the “Install an SSL Certificate on a Domain” option.

  2. I’ve entered the domain name “www.angusaustralia.com.au”.

  3. I’ve entered the IP address “27.124.127.2”.

  4. I’ve entered the certificate issued to me.

-----BEGIN CERTIFICATE-----
MIIFnDCCBISgAwIBAgIRAP/vaD7B7JaVJvqC2H7jiDcwDQYJKoZIhvcNAQELBQAw
gZMxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpOZXcgSmVyc2V5MRQwEgYDVQQHEwtK
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4k2KzJArfl+gUFucAIPWEwO2ljXMgOmHCtuTycUmir2KDg5OIDzv7M5snwMVNQs7
-----END CERTIFICATE-----
  1. I’ve entered the private key (not listed below).

  2. I’ve entered the following certificate key chain (many combinations of the below, but I believe this “longer” keychain should work, as per the discussion on the SSLLabs website). This keychain includes the older “USERTrust RSA Certification Authority”, which should be trusted by older devices.

-----BEGIN CERTIFICATE-----
MIIGFzCCA/+gAwIBAgIQckB41CE86gO/FOVeP1YCNzANBgkqhkiG9w0BAQwFADCBiDELMAkGA1UE
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFdzCCBF+gAwIBAgIQE+oocFv07O0MNmMJgGFDNjANBgkqhkiG9w0BAQwFADBvMQswCQYDVQQG
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-----END CERTIFICATE-----
  1. Now, it appears as if SSLLabs is caching the old result, because when I clear everything from Chrome on my Mac (from the “beginning of time”), the new certificate chain above is detected, as per my previous edit.

EDIT 3

The answer Michael Hampton gave was correct. However, the reason why the solution he proposed didn’t work was because WHM has a bug with updating the certificate authority bundle. When this bug occurs, no matter what text you paste into the Certificate Authority Bundle field (on the SSL/TLS -> Install an SSL Certificate on a Domain page), the contents will be replaced with a different CA bundle despite WHM giving you a success message.

My answer:


Your domain’s certificate has two paths to two different root certificate authorities.

On modern desktop browsers such as Google Chrome, as well as on newer Android versions, the path being taken is to the more recent USERTrust RSA Certification Authority root certificate. (I get this on Android 7.0 NPD90G.)

On older Android versions, the path being taken is to the older AddTrust External CA Root root certificate.

On this second path, you are missing an intermediate certificate. This is the one shown in the SSL Labs test as an “Extra download”. In order to resolve the problem, you need to obtain this intermediate certificate and add it to the certificate chain in your web server.


View the full question and answer on Server Fault.

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