Connection lost when using SSL

Client that is connected with SSL, that stays idle for a while, will be disconnected.
To reproduce

• start the server with ssl, e.g

  perl mysql-test-run.pl ssl --start

• connect with ssl client, e.g

  mysql -uroot --port=16000 --ssl

• issue a command, e.g SELECT 1
• wait 1 minute
• repeat SELECT 1

• see

  ERROR 2013 (HY000): Lost connection to MySQL server during query