# Server issues
🦄 Chevereto V4 users
Check the updated documentation at ⛑️ Troubleshoot (opens new window).
Not all web servers follow basic standards and in some cases even having a server that meets the server requirements you could find issues that won't allow Chevereto to work.
# Webserver
- Apache 
mod_rewritedisabled orAllow Override Allmissing in virtual hosts - Missing writing permissions in Chevereto paths
 - Bad or invalid setup (timezone, multi-views, timeout, etc.)
 - Wrong NGINX server block / PHP-FPM issues
 mod_securityor any other artifact blocking requests from/to
# PHP
PHP runs over your web-server in different favours and with different libraries and settings that can cause issues:
- Outdated PHP version
 - Misconfiguration in PHP libraries
 - Bad php.ini directives
 - Low execution time
 - Bad sessions setup
 - Open basedir restrictions
 
# MySQL Database
- Wrong credentials (user/password)
 - Invalid or missing privileges (read/write in the database)
 - Outdated MySQL version
 - Bad configured MySQL socket
 - Usage of MyISAM storage engine (
ALTERtable to InnoDB storage) 
← Errors