If YouTube says your RTMP publish was rejected with error code 2, first refresh the stream key and update your encoder, then verify the active stream URL and protocol in YouTube Live Control Room. The exact phrase “publish rejected with error code 2” is not defined in the public YouTube help pages cited below, so the code alone does not establish whether the problem is credentials, connection, or stream format. Use the encoder log and Live Control Room message to choose the right fix.
What does YouTube RTMP publish error code 2 mean?
YouTube’s public help pages do not assign a documented meaning to the exact message “publish rejected with error code 2.” Do not assume it always means a bad stream key, blocked port, or codec mismatch. The wording may come from the encoder or another part of the connection path rather than a YouTube-defined error code.
Start by distinguishing three situations: the encoder cannot connect to YouTube’s ingest endpoint; it connects but YouTube rejects the publishing attempt; or the stream reaches YouTube but Live Control Room reports an ingest or stream-health problem. The exact log line and dashboard message determine which branch to follow. YouTube’s guide for encoder startup errors recommends getting a new stream key in Live Control Room and updating the encoder. YouTube Help: Troubleshoot your YouTube live stream.
Troubleshoot the rejection in order
1. Capture the full error and its context
Before changing settings, record the complete error text, the encoder or app and its version, and whether it reports a connection failure or a publish rejection. Check the matching message in Live Control Room as well. Keep stream keys private: redact them from screenshots, logs, and support requests you share publicly.
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2. Refresh the stream key
- Open YouTube Studio and enter the Live Control Room for the stream you are setting up.
- Open the Stream setup and copy the stream key for that stream.
- Replace the key in your third-party encoder, then try starting the stream again.
This is YouTube’s recommended first fix for an error when starting a third-party encoder. Do not post the new key or include it in an unredacted log. YouTube Help’s startup troubleshooting steps.
3. Verify the ingest URL and protocol
Copy the stream URL from the active Live Control Room setup; do not rely on a URL saved from an older session or another stream. If you select RTMPS, reveal and copy the RTMPS URL and make sure your encoder supports RTMPS. YouTube suggests port 443 for certain SSL errors, but that guidance applies when the actual error points to SSL—not as a universal fix for code 2. YouTube Help: Fix live stream errors.
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4. Determine whether YouTube received the stream
- No connection established: Check the copied endpoint, selected protocol, network path, and encoder compatibility first. The encoder’s detailed connection log can help identify where setup fails.
- Connected, then rejected: Confirm the key and active stream setup, then use the exact rejection text in the encoder log and Live Control Room to narrow the cause.
- Stream appears, but Live Control Room reports ingest errors: Follow the dashboard’s specific message. YouTube lists format and stream-health issues involving codec, container, bitrate, video settings, and keyframe frequency; these are categories to investigate when indicated, not proof that they caused every publish rejection. YouTube Help: live encoder settings and error guidance.
5. Check encoder and outbound network health
Update the encoder, inspect its local output, and check its dashboard for errors and CPU load. If the encoder appears healthy but the stream is not reaching YouTube reliably, test the outbound internet connection. YouTube also suggests trying another encoder as a diagnostic; if the outbound connection is faulty, contact your internet service provider. YouTube Help: Troubleshoot your YouTube live stream.
Check stream settings only when the evidence points to ingest
Once connected, compare the encoder output with YouTube’s current guidance and the particular Live Control Room warning. YouTube supports RTMP and RTMPS and documents supported video and audio options. Its recommended keyframe interval is two seconds and should not exceed four seconds. These settings matter when the stream reaches ingest or the dashboard identifies a format problem; changing them is not a substitute for checking the key and endpoint when the encoder cannot publish. YouTube Help: live encoder settings and error guidance.
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Why an OBS “-2” log is not the same diagnosis
An OBS forum thread from 2020 described a macOS connection log ending in -2: Connection to rtmp://a.rtmp.youtube.com/live2 failed: -2. An OBS forum administrator suggested disabling bind-to-IP and network optimizations; the user later reported that, in that case, a socket-loop setting carried over from an imported Windows profile was responsible. That historical, case-specific connection failure does not define YouTube’s “publish rejected with error code 2” or prove that the two messages share a cause. OBS forum thread.
Common symptoms and next actions
| What you see | What to check next |
|---|---|
| Encoder reports a startup error before connecting | Refresh the stream key and update the encoder; verify the active stream URL and protocol. |
| Connection or SSL error | Copy the endpoint and protocol from Live Control Room. For a reported SSL error, check YouTube’s RTMPS guidance, including its port 443 suggestion for certain SSL errors. |
| Encoder connects but Live Control Room reports a stream error | Use the dashboard message to inspect the relevant codec, container, bitrate, video settings, or keyframe frequency. |
| Encoder looks healthy, but delivery is unreliable | Check encoder errors and CPU load, test outbound internet, and try another encoder as a diagnostic. Contact your ISP if the outbound connection appears faulty. |
| OBS log ends in “-2” | Treat it as an OBS connection log, not a documented decoding of YouTube’s publish-rejection code. Inspect the exact OBS configuration and log context. |
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