WebSocket connection failed?
Find the failed stage, inspect the original connection, and test again after one change.
In short: Find which stage failed (connect, first message, or close), change one thing, and test again from the same environment. Treat close code 1006 as "ended without a close frame", not as a cause.
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Start with a control check
Can this browser complete a WebSocket exchange?
The NetOkay test opens a fixed echo endpoint, checks one exact reply, and observes the close. Your application’s server is a separate test.
Run the WebSocket test →1. Identify the stage that failed
- Could not connect: retry once. In your application’s developer tools or logs, inspect the actual WebSocket URL and handshake. Browser errors may not expose the underlying reason.
- Opened, but no expected message: check the application’s message format and authentication. A normal application endpoint need not behave like an echo server.
- Closed unexpectedly: record the observed close code and when it happened. The NetOkay echo check expects normal closure after its reply.
2. Interpret close codes carefully
Code 1000 describes normal closure. Code 1006 represents an
abnormal closure without a received close frame; it does not identify which network
component or server caused it. See the
MDN close-code reference
and the NetOkay close code reference.
A short successful echo exchange does not verify a long-lived application session, reconnect behavior, authorization, or the application’s own protocol.
3. Inspect the original connection
Check the URL, scheme, port, path, and authentication expected by your server. For a reverse proxy you operate, inspect WebSocket upgrade configuration and logs on both sides. Nginx documents its WebSocket proxy configuration.
If NetOkay works but the application does not, compare network and proxy settings in the failing environment. If NetOkay also fails, test again after one deliberate network change; this helps narrow the investigation without assuming a cause.
4. Use a target check with the right scope
The website/API command checks HTTP or HTTPS reachability from a terminal. It does not by itself validate your WebSocket message protocol. For supported WebSocket target templates, read the CLI transport documentation.