127.0.0.1 is localhost which sounds right if prowlarr is in the same machine as the other services.
Is prowlarr running?
Most likely an update broke something if it suddenly stopped working.
this post was submitted on 04 Jul 2024
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It was indeed an update, I had to reinstall prowlarr and it started working again thanks for your help!
127.0.0.1 is the loopback address. Ie it's your computer trying to reach a service its hosting (prowlarr)/talk to itself. Sonarr/Radarr should be using this address as long as prowlarr+sonarr/radarr are on the same machine.
Prowlarr is either not running, or port 8080 is blocked by your firewall.