core: fritzbox_netmonitor Failed to establish connection to FRITZ!Box 7490 running ver 7.01

Home Assistant release with the issue: Home Assistant : 0.84.6

Last working Home Assistant release (if known): Unknown. This is new installation for this component.

Operating environment (Hass.io/Docker/Windows/etc.): Docker

Component/platform: https://www.home-assistant.io/components/sensor.fritzbox_netmonitor/

Description of problem: Fritzbox netmonitor is not able to connect. However on same platform Fritz devicetracker and fritzbox_callmonitor is working (with same login ID and password). Already ensured, that all the components are installed with latest versions (see additional information for version information for fritzconnection and its dependency) .

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

- platform: fritzbox_netmonitor
  name: Fritz
  host: !secret fritz_add
  username: !secret ha_fritz_ID
  password: !secret ha_fritz_PW

Traceback (if applicable):

2018-12-31 13:29:18 ERROR (SyncWorker_7) [homeassistant.components.sensor.fritzbox_netmonitor] Failed to establish connection to FRITZ!Box: <fritz_add>

Additional information:

1. Fritz OS Version : FRITZ!OS: 07.01
2. Fritzconnection and dependency version pip install fritzconnection Requirement already satisfied: fritzconnection in /usr/local/lib/python3.6/site-packages (0.6.5) Requirement already satisfied: requests>=2.2.0 in /usr/local/lib/python3.6/site-packages (from fritzconnection) (2.20.1) Requirement already satisfied: lxml>=3.2.5 in /usr/local/lib/python3.6/site-packages (from fritzconnection) (4.2.5) Requirement already satisfied: urllib3<1.25,>=1.21.1 in /usr/local/lib/python3.6/site-packages (from requests>=2.2.0->fritzconnection) (1.24.1) Requirement already satisfied: chardet<3.1.0,>=3.0.2 in /usr/local/lib/python3.6/site-packages (from requests>=2.2.0->fritzconnection) (3.0.4) Requirement already satisfied: certifi>=2017.4.17 in /usr/local/lib/python3.6/site-packages (from requests>=2.2.0->fritzconnection) (2018.11.29) Requirement already satisfied: idna<2.8,>=2.5 in /usr/local/lib/python3.6/site-packages (from requests>=2.2.0->fritzconnection) (2.7)