# ngrok documentation: Errors

> Index of all 1865 ngrok error codes (ERR_NGROK_*). Each error page explains what the error means and how to fix it. To read one error directly, fetch https://ngrok.com/docs/errors/err_ngrok_<code>.md with the code in lowercase, such as https://ngrok.com/docs/errors/err_ngrok_8012.md.

## Errors

- [Errors](https://ngrok.com/docs/errors/index.md): How ngrok error codes work, how to use them when troubleshooting or handling errors programmatically, and the most common errors.
- [Errors Reference](https://ngrok.com/docs/errors/reference.md): Complete reference for all ngrok error codes. Find explanations, causes, and fixes for every ngrok tunnel, agent, and API error in one place.

## Indexes

> The links below point to error code indexes. Follow each index to reach the error pages.

- [ERR_NGROK_0-999 (304 errors)](https://ngrok.com/docs/errors/llms/0-999/llms.txt): Error codes ERR_NGROK_0 through ERR_NGROK_999.
- [ERR_NGROK_1000-1999 (272 errors)](https://ngrok.com/docs/errors/llms/1000-1999/llms.txt): Error codes ERR_NGROK_1000 through ERR_NGROK_1999.
- [ERR_NGROK_2000-2999 (78 errors)](https://ngrok.com/docs/errors/llms/2000-2999/llms.txt): Error codes ERR_NGROK_2000 through ERR_NGROK_2999.
- [ERR_NGROK_3000-3999 (104 errors)](https://ngrok.com/docs/errors/llms/3000-3999/llms.txt): Error codes ERR_NGROK_3000 through ERR_NGROK_3999.
- [ERR_NGROK_4000-4999 (79 errors)](https://ngrok.com/docs/errors/llms/4000-4999/llms.txt): Error codes ERR_NGROK_4000 through ERR_NGROK_4999.
- [ERR_NGROK_5000-5999 (118 errors)](https://ngrok.com/docs/errors/llms/5000-5999/llms.txt): Error codes ERR_NGROK_5000 through ERR_NGROK_5999.
- [ERR_NGROK_6000-6999 (89 errors)](https://ngrok.com/docs/errors/llms/6000-6999/llms.txt): Error codes ERR_NGROK_6000 through ERR_NGROK_6999.
- [ERR_NGROK_7000-7999 (183 errors)](https://ngrok.com/docs/errors/llms/7000-7999/llms.txt): Error codes ERR_NGROK_7000 through ERR_NGROK_7999.
- [ERR_NGROK_8000-8999 (15 errors)](https://ngrok.com/docs/errors/llms/8000-8999/llms.txt): Error codes ERR_NGROK_8000 through ERR_NGROK_8999.
- [ERR_NGROK_9000-9999 (44 errors)](https://ngrok.com/docs/errors/llms/9000-9999/llms.txt): Error codes ERR_NGROK_9000 through ERR_NGROK_9999.
- [ERR_NGROK_10000 and above (256 errors)](https://ngrok.com/docs/errors/llms/10000-and-above/llms.txt): Error codes ERR_NGROK_10000 and higher.
- [Named error codes (323 errors)](https://ngrok.com/docs/errors/llms/named/llms.txt): Error codes that use a name instead of a number, such as ERR_NGROK_SHIP_APP_NOT_FOUND.