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Troubleshooting

talha nizamani edited this page Mar 4, 2026 · 1 revision

This page collects the most common operational problems and where to look first.

Startup problems

The app exits immediately

Check:

  • incomplete dependencies
  • invalid settings
  • invalid host or port
  • incompatible mode and tunnel combination
  • directory path problems

The app starts but the browser page does not load

Check:

  • the bound host and port
  • whether the saved config differs from the command you expected
  • whether another process is already using the port

Access problems

Other LAN devices cannot open the site

Check:

  • whether you are actually using LAN mode
  • whether the host binding is network-reachable
  • whether clients are using the correct address

The browser shows security warnings

Check:

  • whether the site is being opened over plain HTTP
  • whether certificate and hostname expectations match your deployment
  • whether clients are opening the site by an address different from the one you planned

Download problems

One large download makes the site unresponsive

This usually means the active download load is consuming too much request-handling capacity. Review:

  • worker thread count
  • max concurrent downloads
  • real client load during testing

Large downloads fail or stall

Check:

  • file path validity
  • permissions on the shared folder
  • client connection reliability
  • whether the machine is overloaded under concurrent transfers

Some users can browse but cannot download

Check:

  • the exact link path
  • file existence in the shared folder
  • path confinement behavior
  • whether the file was moved or renamed after the page loaded

Monitor and logging problems

Monitor output is too noisy

Reduce request logging verbosity.

Monitor output is not visible

Check whether monitor mode is enabled.

Public access problems

Public mode does not behave as expected

Check:

  • whether the mode is actually public
  • whether tunnel behavior is enabled as required
  • whether your expectations are LAN-only or truly public

When in doubt

Use this recovery approach:

  1. revert to local mode
  2. use a simple shared folder
  3. disable non-essential extras
  4. confirm the app works locally
  5. step forward one change at a time

Related pages

63xky File Server's Wiki

Getting started

Using the app

Help

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