Webhooks/Sidekiq issue on dev instance

dev
1

I run 2 Discourse instances:

  1. a standard one (Docker)
  2. a dev one, behind a nginx proxy

I’ve set up the same webhook on both instances. It works well from the standard instance, but not from the dev instance:

  • the Ping button never gets a response and stays gray, although the corresponding POST event seems to appear in the nginx log (EDIT: this log entry is about the click event localhost->Discourse, not the outgoing webhook ping message).

  • I see no error in the Discourse server console or nginx logs.

What should I check?