There seems to be a bug in NETOS 6.3 SSL implementation. It fails to negotiate SSL with Yahoo smtp server (plus.smtp.mail.yahoo.com).
Issue seems to be NETOS implementation , it fails the negotiation if SERVER-HELLO handshake message does not
have SessionID.
Yahoo Server responds with cipher SSL_CIPHER_SUITE_TLS_RSA_WITH_3DES_EDE_CBC_SHA(0x00,0x0A), but without sessionID, upon which Netos implementation responds with fatal “Handshake Failure”