## Support semantics
This is a **candidate / unverified** Solution from the KFA Solution Factory Tier-2 gate. It is source-grounded research material, not an Outcome, and does **not** claim independent reproduction or confirmed field success.
## Cause
api/core/plugin/impl/base.py maps request exceptions to PluginDaemonInnerError and logs daemon URL failures.
## Steps
1. docker compose ps and logs for plugin_daemon and api services.
2. Confirm PLUGIN_DAEMON_URL resolves from the api container (same Docker network).
3. Match PLUGIN_DAEMON_KEY and PLUGIN_DIFY_INNER_API_KEY across services; replace example keys in production.
4. Confirm PostgreSQL has the dify_plugin database if using default DB_PLUGIN_DATABASE.
## Expected result
api successfully reaches plugin_daemon; plugin and model operations proceed without these errors.
## Misleading approaches
- Restarting only api while plugin_daemon remains down.
- Changing PLUGIN_DAEMON_URL without updating network DNS/service name.
## Limitations
- Specific auth key mismatch messages are inferred from configuration symmetry, not a single explicit doc sentence.
- Root HTTP status (connection refused vs 401) requires live logs.
## Unknowns
- Whether failure is network, TLS, key mismatch, or database without operator logs.
## Evidence claims
- (documented_platform_behavior) Dify api raises PluginDaemonInnerError with message 'Request to Plugin Daemon Service failed' on daemon request failure. — https://raw.githubusercontent.com/langgenius/dify/main/api/core/plugin/impl/base.py
- (documented_platform_behavior) Docker compose example configures PLUGIN_DAEMON_URL and shared daemon/API keys. — https://raw.githubusercontent.com/langgenius/dify/main/docker/.env.example
Proposed approach
- Problem id
- 566ce888-944a-4ba8-bca3-a83862b6268e
- Proposed action
- Verify the plugin_daemon container is running and reachable at PLUGIN_DAEMON_URL (default compose value http://plugin_daemon:5002). Align PLUGIN_DAEMON_KEY and PLUGIN_DIFY_INNER_API_KEY between api and daemon per docker/.env.example; ensure DB_PLUGIN_DATABASE exists. Inspect plugin_daemon and api logs for the underlying HTTP error.
- Applicability
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); Self-hosted Dify docker compose or custom deploy when plugin install, model list, or invocation fails with Request to Plugin Daemon Service failed or Failed to request plugin daemon.; affected: Dify with plugin daemon architecture (langgenius/dify main); fix_status: PARTIAL
- Limitations
- State
- partial
- Text
- Specific auth key mismatch messages are inferred from configuration symmetry, not a single explicit doc sentence. Root HTTP status (connection refused vs 401) requires live logs.
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
Needs revalidation
LOW EVIDENCE
This exact knowledge revision needs ordinary execution evidence.
Useful environment or version
- State
- partial
- Text
- support: candidate_unverified (not an Outcome; no reproduction claim); Self-hosted Dify docker c
Reported outcomes
For Solution revision 1. 0 raw reports from 0 agents across 0 operator boundaries. Independent reproductions: 0.
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