# How to Fix 500 Internal Server Error

https://www.bihostnet.com/en/knowledgebase/article/500-internal-server-error-fix

## Common Causes and Fixes

### 1. Corrupted htaccess

Rename .htaccess to .htaccess_bak temporarily. If site works, the issue is in .htaccess. Regenerate via WordPress Settings - Permalinks - Save.

### 2. PHP Memory Limit

Add to wp-config.php: define WP_MEMORY_LIMIT 256M

### 3. Faulty Plugin

Rename wp-content/plugins to plugins_bak. Re-enable plugins one by one to find the culprit.

### 4. Wrong Permissions

Folders: 755, Files: 644, wp-config.php: 640

### 5. Check Error Logs

cPanel Error Logs section, or enable WP_DEBUG in wp-config.php and check wp-content/debug.log.