Site Health: The REST API encountered an error / Your site could not complete a loopback request (cURL error 28)

2003 MySQL ERROR 2003 (HY000): Can't connect to MySQL server on 'host:3306' (111) 407 HTTP 407 Proxy Authentication Required 511 HTTP 511 Network Authentication Required AbortError AbortError: The user aborted a request. / signal is aborted without reason client_loop: send disconnect: Broken pipe client_loop: send disconnect: Broken pipe (SSH session drops when idle) Client.Timeout exceeded Get "https://registry-1.docker.io/v2/": net/http: request canceled while waiting for connection (Client.Timeout exceeded) ConnectException java.net.ConnectException: Connection refused ConnectionRefusedError ConnectionRefusedError: [Errno 111] Connection refused Could not resolve host fatal: unable to access 'https://github.com/…': Could not resolve host: github.com cURL error 28 cURL error 28: Operation timed out after 30001 milliseconds with 0 bytes received Download failed WordPress: Download failed. A valid URL was not provided / cURL error 60 / Could not resolve host: downloads.wordpress.org early EOF fatal: early EOF — fatal: index-pack failed ECONNREFUSED Error: connect ECONNREFUSED 127.0.0.1:5432 ECONNRESET Error: socket hang up / read ECONNRESET ECONNRESET npm ERR! code ECONNRESET — network aborted / socket hang up ENOTFOUND Error: getaddrinfo ENOTFOUND host / Name or service not known ENOTFOUND npm ERR! code ENOTFOUND — request to https://registry.npmjs.org/x failed, reason: getaddrinfo ENOTFOUND registry.npmjs.org ERR_ABORTED net::ERR_ABORTED 404 (Not Found) ERR_BLOCKED_BY_CLIENT net::ERR_BLOCKED_BY_CLIENT ERR_CONNECTION_REFUSED net::ERR_CONNECTION_REFUSED (This site can't be reached — refused to connect) ERR_CONNECTION_RESET ERR_CONNECTION_RESET: This site can’t be reached — The connection was reset ERR_CONNECTION_TIMED_OUT ERR_CONNECTION_TIMED_OUT: This site can’t be reached — example.com took too long to respond ERR_STREAM_PREMATURE_CLOSE Error [ERR_STREAM_PREMATURE_CLOSE]: Premature close Failed to fetch TypeError: Failed to fetch / NetworkError when attempting to fetch resource fetch failed TypeError: fetch failed (cause: ConnectTimeoutError / ECONNREFUSED / UND_ERR) kex_exchange_identification kex_exchange_identification: Connection closed by remote host Missed schedule WordPress: Missed schedule — scheduled posts not publishing (WP-Cron not running) No route to host connect: No route to host (EHOSTUNREACH) Not a valid JSON response WordPress: Updating failed. The response is not a valid JSON response. npm ETIMEDOUT npm ERR! code ETIMEDOUT — network request to https://registry.npmjs.org/x failed, reason: connect ETIMEDOUT port 22 timed out ssh: connect to host github.com port 22: Connection timed out requests ConnectionError requests.exceptions.ConnectionError: HTTPSConnectionPool(host=…, port=443): Max retries exceeded with url rest_cookie_invalid_nonce WordPress REST API: {"code":"rest_cookie_invalid_nonce","message":"Cookie check failed"} (403) rest_forbidden WordPress REST API: {"code":"rest_forbidden","message":"Sorry, you are not allowed to do that."} (401/403) rest_no_route WordPress REST API: {"code":"rest_no_route","message":"No route was found matching the URL and request method."} RPC failed error: RPC failed; HTTP 400 curl 22 / curl 92 HTTP/2 stream was not closed cleanly — the remote end hung up unexpectedly SocketException reset java.net.SocketException: Connection reset ssh port 22 Connection refused ssh: connect to host x port 22: Connection refused ssh port 22 Connection timed out ssh: connect to host x port 22: Connection timed out Temporary failure in name resolution ping: google.com: Temporary failure in name resolution Unable to connect to the server: dial tcp i/o timeout Unable to connect to the server: dial tcp <ip>:443: i/o timeout UnknownHostException java.net.UnknownHostException: api.example.com You are probably offline WordPress: Updating failed. You are probably offline.