Use this reference with the current value
Start from the value shown by OffVPS or the observation from your own server. Do not substitute a remembered default.
Capture the exact failure
Record hostname, timestamp, client network and the browser, TLS or HTTP error. Keep the last known-good release and recent changes.
Scroll horizontally to read every column on a small screen.
| Layer | Observable check | What a failure narrows |
|---|---|---|
| DNS | Resolve the exact hostname from a representative client | Wrong or stale address |
| TLS | Inspect certificate name, validity and handshake result | Listener or certificate handling |
| Public listener | Check whether the expected port accepts a connection | Network exposure or service listener |
| Reverse proxy | Inspect request-time proxy log and upstream status | Routing or upstream connection |
| Application | Make the same request locally and inspect service status/logs | Process, dependency or application error |
| Data dependency | Check database or queue from the application path | Downstream failure |
Change one layer
If local application response works but the proxy reports an upstream error, inspect proxy destination before touching DNS. If the process is restarting, preserve its first useful log and restart count.
Record recovery evidence
Keep the observed failing layer, the single change made and the request proving recovery.
Keep the next check reproducible
Record the selected field or observed layer, the time, and the result that would confirm the next step.
Documentation used
Primary references for this page. Check the documentation for the version installed in your own environment.