HTTP 509 Bandwidth Limit Exceeded
The server or hosting provider has exceeded the bandwidth limit allocated to the website or account.
Meaning
The server or hosting provider has exceeded the bandwidth limit allocated to the website or account.
Common causes
- Monthly bandwidth quota exceeded
- Sudden traffic spike
- Large files consuming bandwidth
- High-volume API requests
- Hosting plan bandwidth restriction
⚡ Quick fix
- Check current bandwidth usage
- Wait for the bandwidth quota to reset
- Upgrade the hosting plan
- Reduce large file transfers
- Use a CDN for static content
Detailed fix by platform
Apache
- Check hosting provider bandwidth limits
- Review access logs for unusually high traffic
- Enable caching where appropriate
Nginx
- Review traffic and access logs
- Configure caching and compression
- Use a CDN for static assets
Cloudflare
- Review bandwidth and traffic analytics
- Enable caching for static resources
- Check for abnormal traffic or automated requests
How to diagnose
- Check hosting bandwidth statistics —
- Review traffic analytics —
- Identify large or frequently requested files —
- Check for traffic spikes or bots —
- Review CDN and server logs —
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Last updated 6 Oct 2026