Diagnostics helps collect or review clues to distinguish issues with resolution, connectivity, authentication, and rule routing. Find the relevant option in Settings, read the available tool and output descriptions, then reproduce the issue once. Tools and details vary by platform and interface; a missing option does not mean the app cannot connect.
Start troubleshooting with one specific destination. Note whether you’re on Wi-Fi or Cellular, the Global Routing mode, selected server, active Config, and what failed. Check the basic network first, then server connectivity and authentication, followed by DNS and rule matches. Restore On Demand and other automation last. Change one variable per test and record the result so multiple changes don’t hide the cause.
For example, if a destination works in Proxy but fails in Config, keep the server unchanged and check whether a broader rule matched first and whether its policy is expected. If both modes fail, investigate server settings, the current network, and the destination instead of repeatedly moving FINAL. Rule, server, and system network issues require different evidence.
Before sharing diagnostics, check for subscription URLs, authentication fields, personal domains, device information, or browsing records, and redact them as needed. Share only the reproduction steps, relevant errors, and necessary rule snippets; don’t publish the full configuration to get troubleshooting advice. After resolving the issue, restore temporary test settings and verify the everyday Config and On Demand conditions.
Continue to the Configuration Structure and Rule Matching Reference