Aggregate is no longer being updated and not being supported. We recommend you use Central instead.
As to what is happening here, your best bet is to look at the Aggregate and Tomcat logs. My guess is that your new SSL cert has a root cert that is too new for your Android device.
To confirm, go to https://www.ssllabs.com/ssltest, run a test and check the Handshake Simulation under Configuration to see what devices are supported. Here's what a well-configured server looks like.
