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To diagnose an SRS publish error, capture one failed publishing attempt, locate the log output for your specific SRS deployment, and trace the matching session from connection through publisher authorization and incoming packets. Then check the target app/stream, any configured on_publish callback, and packet timing indicated by the logs. There is no single log path or universal error-to-fix list for every SRS version and deployment.
What to record before troubleshooting
Write down the details for one reproducible failure before changing configuration. This makes it easier to compare the publisher’s report with the server’s timeline.
- SRS version and deployment method, such as a source build, package, or container.
- The configuration file in use and the server’s log destination.
- Publishing client and protocol, such as FFmpeg or OBS publishing to RTMP.
- Destination host and port, plus the intended application and stream name.
- The reproduction time and time zone, along with the publisher-side error.
SRS documentation labels version 6.0 stable, but paths and messages can vary by release and deployment. Check the instructions for the version actually running rather than assuming an example from another release applies. SRS 6 introduction
Find the log output for your installation
Start with the SRS configuration and the way the server was launched. Depending on deployment, output may be in a configured file, the process’s working directory, or the package or container’s logging output. The official SRS 7 getting-started guide demonstrates this command:
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tail -n 30 -f ./objs/srs.logThat path is an example from the SRS 7 build guide, not a guaranteed location for SRS 6 or for package and container installations. Confirm the log sink for your own setup before relying on it. SRS getting started
If you can reproduce the issue, start watching the appropriate output immediately beforehand. Capture the publisher-side message and the corresponding server lines together; either view alone may omit the stage where the attempt failed.
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Trace the failed publishing session
Follow the timeline around the failed attempt instead of diagnosing from one isolated line. When the logs expose a session or client identifier, use it to correlate related entries. Look for the connection and handshake, application or virtual host, publisher identity, stream name, metadata, and disconnect information where available. These fields are illustrated in the archived SRS 4 log guide; current versions may use different text or labels. SRS 4 log guide
The log evidence can help distinguish stages: a connection problem occurs before publisher identification; an authorization rejection can occur after the server receives the publishing request; and a stalled input may show up after connection. A publisher can also connect successfully while a later viewer or playback problem remains. SRS describes its receive-and-push media-server model and supports clients including FFmpeg and OBS. SRS 6 introduction
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Check the destination and stream name
Compare the publisher’s exact destination with the server address, application, and stream you intend to publish. An SRS documentation example is rtmp://localhost/live/livestream; for a real deployment, replace the host, app, and stream with the values configured for that server. SRS getting started
- Verify the hostname or IP address and port point to the intended SRS server.
- Check that the application and stream segments match the expected destination.
- Compare the client configuration with the server log’s reported publisher and stream details, if present.
- Determine whether the failure is actually in publishing or occurs later when a viewer tries to play the stream.
Inspect an enabled publish callback
If the server uses an on_publish HTTP callback, that callback can intentionally reject a publisher. SRS’s callback documentation says a successful response requires HTTP 200 and an error value of zero; a non-200 HTTP status or nonzero error value causes disconnection. The cited instructions are from SRS 5 documentation, so verify the applicable configuration and behavior for your deployed release. SRS HTTP Callback
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- Confirm whether an
on_publishcallback is configured for the relevant application or stream. - Check whether SRS can reach the callback endpoint and inspect the request for the failed attempt.
- Review the callback’s policy decision for that publisher and stream.
- Check the actual HTTP status and response error value received by SRS; a policy decision that appears valid in the callback application is not enough if the response reaching SRS is non-200 or carries a nonzero error.
Check for missing or delayed publish packets
If the session connects but input stalls, compare the observed timing with the configured publish packet timeouts. SRS 6 documentation lists defaults of 20000 ms for the first-packet timeout and 5000 ms for the normal packet timeout; configuration can change these values. Treat them as timing checks, not as a general reason to increase timeouts. SRS 6 Special Control
- For a first-packet timeout, check whether the publisher sent an initial packet after establishing the session.
- For a normal packet timeout, check whether input stopped or gaps between packets exceeded the configured interval.
- Only consider a timeout change if the logs and observed packet timing support it, and compare the result against the same reproduction.
Use status and metrics as supporting evidence
SRS 6 describes an HTTP API for querying system and stream status, a Prometheus exporter, and session-level traceable logs. If these are already available in your deployment, they can complement the session log by helping you examine server or stream state. They are not prerequisites for diagnosing every publish failure. SRS 6 introduction
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The SRS 6 introduction describes its session-level traceable logs as a way to reduce system maintenance costs. The value for a specific incident is practical: correlate the session and time with the client and callback evidence rather than treating a general status reading as proof of the cause. SRS 6 introduction
Validate the fix with the same attempt
- Repeat the same publishing action with the same client and destination.
- Check the corresponding server time window and confirm the session progresses past the stage that failed before.
- Confirm the intended stream is visible using a playback method and protocol enabled in your own SRS configuration.
- If the result differs, compare the new session evidence with the original instead of changing unrelated settings.
SRS getting-started material shows example RTMP, HTTP-FLV, and HLS playback URLs, but the protocol available to you depends on your server configuration. A successful publish and a successful downstream playback check are separate results. SRS getting started
Troubleshoot by evidence, not by guessed error mapping
| Evidence in the attempt | What to check next |
|---|---|
| No matching server session appears during the attempt | Confirm you are watching the correct log sink and time window, then compare the publisher destination host and port with the intended server. |
| The session appears, but the app or stream differs from what you expected | Compare the publisher URL’s app and stream segments with the intended SRS destination. |
An enabled on_publish callback is followed by disconnection |
Inspect the callback request, decision, HTTP status, and response error value. |
| The connection is present, but packet input appears stalled | Compare first-packet arrival or packet gaps with the configured publish timeout values. |
| Publishing appears to progress, but a viewer cannot play the stream | Separate the publish result from playback: verify the expected app and stream and use a protocol enabled in the server configuration. |
These are diagnostic branches, not a complete SRS error-message dictionary. Exact messages can differ across versions, and the official documentation cited here does not establish a universal mapping from every error string to one remedy.
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