I initially met this issue but fixed after several changes on nginx https config and Lemmy config.
The background is that after I joined the Lemmy society, everyday we got feedbacks that ppl are facing federation issues with 0 comments on posts and subscribing issues.
Most of them are using docker compose and seems the config file of Lemmy is out dated from the official documentation.
This thread is for tracking this issue before we can get any root causes and making the PR for fixing it.
Every time when it happens, no useful logs with the default config. seems there shall be a parameter for controlling the Rust logs or we shall add it.