Push an option to the client so that it notifies the server of a restart.

templates/server.conf.j2

@@ -26,6 +26,9 @@ route {{ route }}
 push "route {{ route }}"
 {% endfor %}
 {% endif %}
+{% if openvpn_protocol == "udp" %}
+push "explicit-exit-notify 3"
+{% endif %}
 {% if openvpn_push_settings is defined %}
 {% for dhcp_opt in openvpn_push_settings %}
 push "{{ dhcp_opt }}"