> For the complete documentation index, see [llms.txt](https://docs.ltonetwork.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ltonetwork.com/node/public-node/installation-guide/troubleshooting-faq.md).

# Troubleshooting FAQ

## 1. My public node seems to be up and running but when checking the logs from time to time I get a message of this type:

```bash
Error mining Block: BlockAppendError(Block is not a child of the last block,Block(4Bk5FxnuKMPqZeh4Rfyn1pE6UyNYfznQd7MtUhKtNug15WoxvhkjtCeo4AVMAW2AEXFw2DMfxd1MZ3G71SiJdnUC -> 245bVsJ..., txs=0, features=Set()))
```

When this happens, your node most likely went out-of-sync, in order to fix it you should follow the next steps:

```bash
# stop your node (if spinned up by docker compose)
$ docker-compose down

# sync your node's clock with NTP server
$ sudo service ntp stop
$ sudo ntpdate pool.ntp.org
$ sudo service ntp start

# spin up your node again
$ docker-compose up -d
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.ltonetwork.com/node/public-node/installation-guide/troubleshooting-faq.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.