---
title: "Troubleshooting"
manual: "TYPO3 Explained"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3coreapi:troubleshooting-index@main"
source: "Administration/Troubleshooting/Index.rst"
modified: "2026-09-15T19:16:38+00:00"
---

# Troubleshooting

**[TYPO3](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-typo3@main)**

-   [Reset Backend Administrative User Passwords](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-backend-admin-password@main)
-   [Reset The Install Tool Password](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-install-tool-password@main)
-   [Enabling Debug Mode](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-debug-mode@main)
-   [Caching](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-caching@main)

**[System Modules](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-system-modules@main)**

-   [Log](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-system-modules-log@main)
-   [DB Check](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-system-modules-dbcheck@main)
-   [Configuration](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-system-modules-configuration@main)
-   [Reports](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-system-modules-reports@main)

**[PHP](https://docs.typo3.org/permalink/t3coreapi:examples-debug-php@main)**

-   [PHP Modules](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-php-modules@main)
-   [PHP Caches, Extension Classes](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-php-caches-extension-classes-etc@main)
-   [Opcode cache messages](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-php-troubleshooting-opcode@main)

**[Web server](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-webserver@main)**

-   [Apache - enable mod_rewrite](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-enable-mod-rewrite@main)
-   [Apache - adjust ThreadStackSize (Windows)](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-adjust-threadstacksize-on-windows@main)

**[Database](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-database@main)**

-   [MySQL - character sets](https://docs.typo3.org/permalink/t3coreapi:troubleshooting-character-sets@main)