Forum der Gemeinschaft Firefox

Hello Firefox Community,

I'm experiencing a strange issue with my website, https://www.hostgrap.com.

When I visit the site using Firefox, I get the following error:

Bad gateway Error code 502 Visit cloudflare.com for more information. 2025-05-14 04:02:47 UTC

Browser: Working Cloudflare: Working Host: Error

However, the same website works perfectly fine on other browsers like Chrome, Edge, and Safari.

Troubleshooting steps I’ve tried in Firefox:

Cleared cache and cookies Disabled all extensions Cleared DNS and HTTP cache via about:networking Checked proxy settings (set to system default) Tried Private Window Flushed system DNS Updated Firefox to the latest version

None of the above resolved the issue. The error appears consistently only in Firefox. I’m using Cloudflare for DNS and reverse proxy, and the server is working as expected for all other users/browsers.

Additional Info:

OS: Windows 10 Home Single Language Firefox Version: 138.0.3

This issue happens even after disabling all add-ons

No custom rules in Cloudflare specifically targeting Firefox or its user agent

Is there something Firefox-specific that could be triggering this behavior with Cloudflare or my server?

Thanks in advance!

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John J Schranz

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Hello !

For convenience, I would like to change :

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How can I implement this change ?

Thank you !

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