> Source: [sk185265](https://support.checkpoint.com/results/sk/sk185265)

# sk185265 - Google reCAPTCHA failed to load in Firefox with HTTPS Inspection enabled

| Property | Value |
|----------|-------|
| Solution ID | sk185265 |
| Date Created | 2026-08-12 |
| Last Modified | 2026-09-02 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |
| OS | Gaia |

## Symptoms

- * The issue occurs when the Security Gateway inspects Google reCAPTCHA traffic. In Mozilla Firefox, Google reCAPTCHA fails to load or complete the validation process. The same reCAPTCHA validation succeeds in Google Chrome and Microsoft Edge.
* The browser shows the following error:  
  `Failed to connect to reCAPTCHA. Please check your connection and try again.`
* The issue occurs during the reCAPTCHA validation phase, on the POST request to: `https://www.google.com/recaptcha/api2/reload`
* HAR analysis shows that the following reCAPTCHA resources load successfully with HTTP 200 responses:
  1. /recaptcha/api.js
  2. /recaptcha/api2/anchor
  3. /recaptcha/api2/bframe
  4. Resources from `gstatic.com`

## Cause

When an HTTP/2 stream enters Hold mode, the HTTP/2 parser may stop processing the stream while additional DATA frames remain in the current input buffer.  
After Hold mode is released, the parser may not process the remaining DATA frames that were already buffered. As a result, only part of the HTTP/2 request body is forwarded to the origin server.  

The origin server continues to wait for the remaining request body, while the client waits for a response from the origin server. Consequently, the transaction remains incomplete until the client times out and aborts the request.

## Solution

This solution requires authentication. Please log in to view the full solution.

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