Completed download handling has stopped working

Sonarr Version 3.0.3.687
Sabnzbd Version 2.3.9 [03c10dc]
Windows 10 Pro 64-bit Version 1903 Build 18362.535 :
Debug logs: https://www.dropbox.com/s/mh1iogpiwk3fxpq/sonarr.logs%20.zip?dl=0
Description of issue:
Suddenly a few days ago the handling of completed downloads between SABNZBD and SONARR just stopped working.
No changes had been made that to my system or any applications.

20-1-12 14:26:04.6|Warn|DownloadMonitoringService|Unable to retrieve queue and history items from Sabnzbd

[v3.0.3.687] NzbDrone.Core.Download.Clients.DownloadClientUnavailableException: Unable to connect to SABnzbd, please check your settings ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 127.0.0.1:8080

Sonarr is unable to connect to SAB, either due to the host/port being wrong or a firewall typically.