Skip to content
Contact us
  • There are no suggestions because the search field is empty.

How can I whitelist Prerender's IP addresses and user agents?

To avoid 504 and 403 errors during rendering, whitelist Prerender’s IP addresses and user agents in your firewall settings.

 

Overview

If you see 504 (Gateway Timeout) or 403 (Forbidden) status codes in your CDN Analytics or Render History menus, it means that your firewall is likely blocking or rate-limiting Prerender’s requests. This can result in:

  • Failed renders: Search engine bots are unable to access fully rendered pages.

  • Incomplete content: Bots may receive an unrendered or partial version of your page.

These issues can impact SEO and site performance, as search engines may fail to index your content correctly.

 

Why It Matters

When Prerender’s requests are blocked or limited, the search engine crawlers (such as Googlebot) cannot retrieve the fully rendered content. This means that your site’s content might not be indexed properly, which can harm your search rankings and visibility.

By whitelisting Prerender’s IPs and user agents, you ensure that Prerender can render pages correctly for bots without being blocked or rate-limited.

 

Solution: Whitelist Prerender's IPs and User Agents

To resolve the 504/403 errors, follow these steps to whitelist Prerender’s IP addresses and user agents in your firewall settings:

  1. Whitelisting IP addresses:
    Ensure that your firewall allows requests from Prerender's IP ranges.
    You can find our complete list of IP addresses here:
    Prerender IP Ranges.

  2. Whitelisting User Agents:
    Your firewall should also allow requests from Prerender’s user agents.
    Find the list of supported user agents here:
    Prerender Crawlers.

 

Tips & Notes

  • Firewall Configuration:
    The process of whitelisting Prerender’s IPs and user agents will vary depending on the firewall you are using (e.g., Cloudflare, AWS, etc.). Most firewalls provide documentation to guide you through this process.
    If you’re unsure how to configure this, contact your IT team, development team, or the firewall support team for assistance.

  • Using Links for Easy Implementation:
    When contacting your team, make sure to share the following links:

  • Preventing Future Errors:
    Whitelisting Prerender ensures that search bots will receive fully rendered content without interruptions, preventing issues that can hurt SEO or indexing.

  • Rate Limiting and DDoS Protection:
    Firewalls with rate-limiting or DDoS protection might mistakenly block or limit Prerender requests due to the volume of pages being rendered. Whitelisting Prerender’s IP addresses will prevent this issue.

Get Support

Still have questions or need help? We’re here for you!

If you’ve followed the troubleshooting steps and still can’t resolve the issue, feel free to reach out to our support team. You can contact us via:

To help us resolve your issue as quickly as possible, please gather and include any relevant information, such as:

  • Error messages you're seeing
  • Steps you've already taken to troubleshoot
  • Screenshots or screen recordings (if applicable)

Providing these details up front will help our team diagnose the problem more efficiently and get you back on track faster.

 

Related Articles / FAQs: