YouTrack/Upsource Integration SSLPeerUnverifiedException

I have YouTrack and Upsource configured using a shared Hub and am trying to get the integration between the two working. YouTrack and Hub are running together on the same server and Upsource is on a different server. Both have SSL certificates that are signed by the same internal (self-signed CA).

When I go into YouTrack under Upsource Integration Settings I am seeing "Error when connecting to upsource". If i look in the server logs I see "Error when connecting to upsource" and "SSLPeerUnverifiedException: Hostname myserver not verified"

I have made sure the certificate and CA are trusted by the JVM running YouTrack. Is there some other configuration I am missing to make this work?