Having account on https://lemmings.world, like 10 hours ago I have been trying to post a reply in a community that is hosted on a different instance (monero.town), the progress wheel was constantly turning on the Repply button and the browser developer console (F12) shown Error 502 Bad gateway ("invalid response from the upstream server" - https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/502). "Bad gateway" error is shown by the Lemmy on login form at lemmings.world.
That turning wheel also appears on a new post/topic submission button (creating topic on external lemmy.ml community being on lemmings.world ).
After trying to search in my home instance, https://lemmings.world/search?q=502+error&type=All&listingType=All&page=1&sort=TopAll It output nothing and the console again shown Error 502: