If your Matrix server only federates with specific servers, add marani.app to your allowlist.
Add to homeserver.yaml:
federation_domain_whitelist: - marani.app
Then restart Synapse.
allow_federation: - marani.app
marani.app, it works both ways.The public federation tester will NOT work for your server — the tester itself is not in your allowlist. Instead, test manually:
curl https://marani.app/_matrix/key/v2/server
Or the real test: open Element, search for @fabio:marani.app, send a DM. If it delivers, federation is working.
Server name: marani.app Software: Synapse 1.157.2 Federation: chat.marani.app:443 (SRV) TLS: valid (Lets Encrypt)