# Troubleshooting

> Find the cause of a DS Server problem by its symptom: startup errors, 401 answers and token errors, Document Editor and Viewer connections, and limits on Linux.

- **Product:** DS Server
- **Section:** Documentation
- **Kind:** Topic
- **Path:** DS Server > Troubleshooting
- **Web URL:** https://docs.textcontrol.com/ds-server/troubleshooting/
- **LLMs URL:** https://docs.textcontrol.com/ds-server/troubleshooting/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/ds-server/troubleshooting/llms-full.txt

---

## On This Page

- [Find the Right Page](https://docs.textcontrol.com/ds-server/troubleshooting/#find-the-right-page)
- [Collect the Evidence First](https://docs.textcontrol.com/ds-server/troubleshooting/#collect-the-evidence-first)
- [Where to Start](https://docs.textcontrol.com/ds-server/troubleshooting/#where-to-start)

---

## In This Section

- [Authentication](https://docs.textcontrol.com/ds-server/troubleshooting/authentication/llms.txt): Fix 401 Unauthorized and failed token requests: OAuth off, no authorization header, grant type not allowed, invalid secret, redirect URI, lost admin password.
- [Document Editor and Viewer](https://docs.textcontrol.com/ds-server/troubleshooting/editor-viewer/llms.txt): Fix a Document Editor or Viewer that stays empty: not registered, WebSocket fails or drops, TXTextControl.init errors, a viewer script 401, React with Vite.
- [Installation](https://docs.textcontrol.com/ds-server/troubleshooting/installation/llms.txt): Fix a DS Server that ends at startup with an HTTPS or port error, ignores ASPNETCORE_URLS, misses a runtime, isn't registered or rejects a serial number.
- [Linux](https://docs.textcontrol.com/ds-server/troubleshooting/linux/llms.txt): Fix DS Server problems on Linux: no DOC, RTF or TX support, SVG-only page images, replaced fonts, ARM64 and Alpine, and a log written to another folder.

---

## Nearby

- **Previous:** [Custom Signing Endpoints](https://docs.textcontrol.com/ds-server/plugins/signing/llms.txt)
- **Next:** [Installation](https://docs.textcontrol.com/ds-server/troubleshooting/installation/llms.txt)