ErDuende on Nostr: I’ve set up a local Nostr relay using Haven, which includes the Damus relay ...

I’ve set up a local Nostr relay using Haven, which includes the Damus relay (relay.damus.io) to import and publish notes. However, in both cases, I’m consistently hitting HTTP 503 errors ("Service Unavailable").
Is this happening because of the ban? Has anyone else experienced this? How can I resolve this issue?