Some edits in troubleshoot guide (#434)

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---
title: Troubleshooting problems
description: Encountered an issue with a source? Here are resources to help you troubleshoot it.
description: Encountered an issue with a source or the app? Here are resources to help you troubleshoot it.
lang: en-US
---
# Troubleshooting problems
This page is for when you encounter a problem with a source extension.
This page is for when you encounter a problem with a source or the app.
::: c-danger Common error messages
This is just a list of some errors. Go through [Diagnosis](#diagnosis) even if your problem isn't on the list.
- HTTP Error 4xx
- HTTP Error 5xx
- Unexpected URL
@ -31,6 +32,7 @@ This page is for when you encounter a problem with a source extension.
* **Clear Cache**
* **Clear Cookies**
* **Clear Database**
* **DNS over HTTPS**
* If your downloads are getting stuck, try deleting the queue and trying again.
* Force close **Tachiyomi** and reopen it.
@ -41,7 +43,7 @@ Your issue may have been fixed in the Preview version already, just wait for a n
If any of these help, go to [it only happens to me](#it-only-happens-to-me).
If it's not just you, go to [everyone is having this problem](#everyone-is-having-this-problem).
If none of these help, try asking in our [Discord Server](https://discord.gg/tachiyomi)
If none of these help, try asking in our [Discord Server](https://discord.gg/tachiyomi). State app version, source, manga and chapter with the problem.
### It only happens to me
You may be getting a **CAPTCHA**, may have been IP-banned, or encountered some other counter-measure that website owners deploy against programs like **Tachiyomi**. If that is the case, there is probably nothing that can be done about that. Some of them (like **CAPTCHA**) have to be manually solved, some are temporary (IP bans).
@ -77,6 +79,24 @@ This means that the manga has been licensed and can no longer be read on that so
::: el-collapse-item title="HTTP error 403"
The source you selected may have **Cloudflare** protection on and is enforcing [CAPTCHA](#solving-a-captcha). Please complete the [CAPTCHA](#solving-a-captcha) to fix it.
:::
::: el-collapse-item title="HTTP error 429 (Too Many Requests)"
The source banned your IP address (in most cases it's temporary). We suggest to [migrate](./source-migration.md) part of your manga to another source.
:::
::: el-collapse-item title="HTTP error 5xx"
Most probably the source you are trying to access has problems on their side. Open the source in <Navigation item="webview"/> and check if the site is down.
:::
::: el-collapse-item title="Unable to resolve host / Connection failed"
That means that something prevents your connection with the site. Possible reasons: your internet connection is bad, the app doesn't have access to internet, your ISP have blocked the site, the site is down. Try using different internet connection (switch to Wi-Fi, mobile data or a VPN). Try to enable <Navigation item="more"/><Navigation item="settings"/><Navigation item="settings_advanced"/>**DNS over HTTPS**.
:::
::: el-collapse-item title="java.security.cert.CertPathValidatorException / Chain validation failed"
That means there is a problem with validating source's sertificate.
- Check if the site's certificate have expired. Use an online service for checking SSL certificates. If the certificate have expired, then wait while the site owner will renew it.
- Ensure that you have right date and time set on your phone.
- Try <Navigation item="more"/><Navigation item="settings"/><Navigation item="settings_advanced"/>**Clear cache** and **Clear cookies**.
- Try using different internet connection (switch to Wi-Fi, mobile data or a VPN).
- Try to restart the device.
:::
::: el-collapse-item title="App not installed"
You may encounter this if you're installing an official build over an existing **F-Droid** build due to differing signatures.
Backup your data, uninstall the app, then restore the data in the fresh install.