Why can users behind proxies not see my site?

If some visitors can see your website but others cannot, and the affected visitors are behind a corporate proxy, VPN, or content filter, the issue is usually on their network's side rather than your hosting. Here is what causes this and what you can do about it.

01. Why Proxies Block Websites

Web proxies sit between the visitor and the internet. Every request goes through the proxy first, which decides whether to allow or block it. Proxies block sites for several reasons:

• Content filtering - Corporate and school proxies block categories like "adult content," "gaming," "social media," etc. New or uncategorized sites often get blocked by default.
• Reputation scoring - Some proxy systems check the domain's age, SSL status, and hosting IP against reputation databases. Shared hosting IPs that have previously hosted spam or malware sites may have a lower reputation score.
• Geo-blocking - Some networks restrict access to sites hosted in certain countries or regions.
• SSL/TLS version requirements - Strict proxy configurations may reject connections to sites using older TLS versions or certain cipher suites.

02. Proxy Caching Issues

Proxies cache web pages to reduce bandwidth usage. If you recently updated your website but visitors behind a proxy still see the old version, the proxy is serving a cached copy.

You can help by setting proper cache-control headers in your .htaccess file:

<IfModule mod_headers.c>
  Header set Cache-Control "no-cache, must-revalidate"
  Header set Pragma "no-cache"
</IfModule>

This tells proxies and browsers not to cache the page and to always fetch a fresh copy from the server. Use this selectively (not on static assets like images and CSS) to avoid hurting performance for everyone.

For more on cache headers and .htaccess, see our Complete Guide to .htaccess. For browser caching issues without a proxy involved, see Updated My Site But Still See Old Pages.

03. Server Firewall Blocking Proxy IPs

In some cases, the server firewall may be blocking the proxy's IP address. This happens when:

• Multiple users behind the same proxy trigger brute-force protection. All proxy users share the same outgoing IP, so if one user enters the wrong cPanel or email password several times, the firewall blocks the IP, which blocks everyone behind that proxy.
• Rate limiting - Many requests from the same IP (the proxy) can look like a DDoS attack to the firewall.

The visitor can check if their IP is blocked using our Firewall Unblock tool. If the proxy IP is blocked, they can unblock it from there, or you can open a support ticket and ask us to whitelist the IP.

04. What You Can Do

• Make sure your site uses HTTPS - Some proxies block unencrypted HTTP sites by default. Having a valid SSL certificate helps. See SSL Certificates and HTTPS.
• Check your domain reputation - Use tools like Google Safe Browsing (https://transparencyreport.google.com/safe-browsing/search) to see if your domain is flagged. If it is, clean up any malware and request a review.
• Ask the visitor to try without the proxy - If they can access your site from their phone (off the corporate network), the proxy is confirmed as the cause.
• Contact us about IP reputation - If multiple visitors report issues, the shared hosting IP may have a reputation problem. We can investigate and potentially move your site to a clean IP.

Quick Recap

1. Most proxy blocks are on the visitor's network - Not something you can fix directly
2. Ensure your site uses HTTPS - Proxies are more likely to block plain HTTP sites
3. Check if the proxy IP is firewall-blocked - Use the unblock tool
4. Set cache-control headers - Prevents proxies from serving stale content
5. Ask affected visitors to test off their network - Confirms the proxy is the cause

Understanding proxy and access issues · Last updated March 2026 · Browse all General articles