Man kann sich nun über GCM Pushnachrichten schicken lassen.
java.net.UnknownHostException: Unable to resolve "my.url": No address associated with hostname at java.net.InetAddress.lookupHostByName(InetAddress.java:424)
I can't try the IP address because I'm using a dynamic dns service.
Just to be clear I only get the error when I'm using my VPN service. With the VPN turned off everything works as expected.