Certificate Expiry Sensor won't fetch data from my domain

Hi Folks,

I’m using the Certificate Expiry Sensor to monitor multiple domains.

This was working just fine before 0.87 and I got no clue what changed.

I’ve created the sensors in a package like these:

homeassistant:

sensor:
  - platform: cert_expiry
    host: chris.0x711.de
    name: chris_nullx_cert_expiry

  - platform: cert_expiry
    host: 0x711.de
    name: nullx_cert_expiry

  - platform: cert_expiry
    host: cvoid.de
    name: cvoid_cert_expiry

  - platform: cert_expiry
    host: heise.de
    name: heise_cert_expiry

The Log (in DEBUG mode) only states:

ERROR (SyncWorker_4) [homeassistant.components.sensor.cert_expiry] Connection timeout with server: chris.0x711.de
ERROR (SyncWorker_13) [homeassistant.components.sensor.cert_expiry] Connection timeout with server: 0x711.de

ping/nmap/nc etc. works fine for the mentioned domains (from the server shell and the hass venv aswell)

Could anybody pls help me how to debug it?