IngressRoute works localy but not from outside the cluster

I'm trying to set an IngressRoute to open access to a NodeJS app in a K3S cluster with traefik.

The app runs in a pod, and the Service and IngressRoute are listed in Traefik dashboard with success status.

I can query the app wit success on the command line from inside the cluster, with the domain name (host) and path set in the IngressRoute, but when I run the same query from outside I get no response at all (ERR_CONNECTION_RESET) !

The domain name points to the cluster public IP, so I guess this is a routing issue between the host and the Traefik router.

Can someone help me debug this issue ?