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Error: 'Http/1.1 406 Not Acceptable' When Web Pages Are Accessed Through Internet Explorer While Using GFI WebMonitor

Author: Luis Fernandes

Overview 

This article describes the process to follow when Microsoft Internet Explorer cannot load certain webpages when passing through GFI WebMonitor. The following error message is displayed:

HTTP Error 406 - Not acceptable

 

Process

Environment 

  • GFI WebMonitor 
  • All supported environments

Root Cause

The GFI WebMonitor can only process plain text encoding and that's why it sends the request to the Web servers with Accept-Encoding: FFFF, FFFFFF header, but certain web servers do not accept this kind of header value, hence return a 406 error to the HTTP client.

 

Process

Configure the browser to avoid changing the Accept-Encoding header by GFI WebMonitor.

  1. Open Internet Explorer.
  2. Navigate to Settings > Internet Options.
  3. Click on the Advanced tab.
  4. Uncheck the HTTP 1.1 through proxy connections option.