Lemmy Support

I'm trying to set up a personal Lemmy instance, and I haven't been able to connect to any remote instances.

The JSON test at https://join-lemmy.org/docs/en/administration/troubleshooting.html#other-instances-cant-fetch-local-objects-community-post-etc returns valid JSON for my instance, and when I attempt to access a community on my instance from another, it does show my community exists, but when I try to subscribe it gets stuck on "subscribe pending" with a similar error in my instance's logs.

Federation is enabled on my instance, and I have tried first searching for the community I want.

The error appears to be related to DNS resolution, and indeed I am unable to connect to the Internet at all in the lemmy-lemmy-1 container.

 WARN Error encountered while processing the incoming HTTP request: lemmy_server::root_span_builder: couldnt_find_community: Request error: error sending request for url (https://lemmy.ml/.well-known/webfinger?resource=acct:lemmy_support@lemmy.ml): error trying to connect: dns error: failed to lookup address information: Try again
2023-06-14 13:13:41    0: lemmy_apub::fetcher::resolve_actor_identifier
2023-06-14 13:13:41              at crates/apub/src/fetcher/mod.rs:16
2023-06-14 13:13:41    1: lemmy_apub::api::read_community::perform
2023-06-14 13:13:41            with self=GetCommunity { id: None, name: Some("lemmy_support@lemmy.ml"), auth: Some(Sensitive) }
2023-06-14 13:13:41              at crates/apub/src/api/read_community.rs:30
2023-06-14 13:13:41    2: lemmy_server::root_span_builder::HTTP request
2023-06-14 13:13:41            with http.method=GET http.scheme="http" http.host=lemmy.edgeburnmedia.com http.target=/api/v3/community otel.kind="server" request_id=74953f46-d6a8-41f9-8c4e-6ac51676bb83 http.status_code=400 otel.status_code="OK"
2023-06-14 13:13:41              at src/root_span_builder.rs:16
2023-06-14 13:13:41 LemmyError { message: Some("couldnt_find_community"), inner: Request error: error sending request for url (https://lemmy.ml/.well-known/webfinger?resource=acct:lemmy_support@lemmy.ml): error trying to connect: dns error: failed to lookup address information: Try again
2023-06-14 13:13:41 
2023-06-14 13:13:41 Caused by:
2023-06-14 13:13:41     0: error sending request for url (https://lemmy.ml/.well-known/webfinger?resource=acct:lemmy_support@lemmy.ml): error trying to connect: dns error: failed to lookup address information: Try again
2023-06-14 13:13:41     1: error trying to connect: dns error: failed to lookup address information: Try again
2023-06-14 13:13:41     2: dns error: failed to lookup address information: Try again
2023-06-14 13:13:41     3: failed to lookup address information: Try again, context: "SpanTrace" }