I checked the emulator version, it was 5.1, so it should not be the reason you mentioned. I also checked the logs in fiddler, it sais: "SecureClientPipeDirect failed: System.Security.Authentication.AuthenticationException Fehler bei SSPI-Aufruf"
I checked with wireshark, it is not the server who is closing the connection. It is fiddler who is the first one sending the FIN|ACK packet to the server.
Here is the packet order (not complete, just the important ones), maybe it is interesting:
1. client->server: Client Hello
2. server->client: Server Hello, Change Cipher Spec, Encrypted Handshake Message
3. client->server: Change Cipher Spec, Encrypted Handshake Message
4. client->server: FIN,ACK
Meanwhile I will read the documents you have linked. Thanks!