What does this error mean?

BackendlessFault{ code: ‘Internal client exception’, message: ‘Unacceptable certificate: CN=Let’s Encrypt Authority X3, O=Let’s Encrypt, C=US’, detail: 'javax.net.ssl.SSLHandshakeException: Unacceptable certificate: CN=Let’s Encrypt Authority X3, O=Let’s Encrypt, C=US

It means the client app could not connect to the server via ssl. This may happen for older versions of Android.


it’s android things 1.6 and it was working till today and nothings changed from our side!

DataQueryBuilder queryBuilder = DataQueryBuilder.create();
queryBuilder.setWhereClause(whereClause );


                                new AsyncCallback<List<Map>>() {
        public void handleResponse (List < Map > foundD)
            // every loaded object from the "Contact" table is now an individual java.util.Map
            String doorP = foundD.get(0).get("doorPincode").toString();
        public void handleFault (BackendlessFault fault )
            // an error has occurred, the error code can be retrieved with fault.getCode()

Nothing changed on our side either. Try a different device, network, proxy settings, etc