The requested resource is only capable of generating content not acceptable according to the Accept headers sent in the request. A client (e.g. your Web browser) can indicate to the Web server (running the Web site) the characteristics of the data it will accept back from the Web server.

The requested file exists but cannot be used as the client system doesn't understand the format the file is configured for.

The resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.

Unless it was a HEAD request, the response SHOULD include an entity containing a list of available entity characteristics and location(s) from which the user or user agent can choose the one most appropriate. The entity format is specified by the media type given in the Content-Type header field. Depending upon the format and the capabilities of the user agent, selection of the most appropriate choice MAY be performed automatically. However, this specification does not define any standard for such automatic selection.

It's possible you have requested a page that contains files which your browser has indicated to the server that it cannot accept, for example, a multimedia file that your browser cannot process. You might check the preferences settings of your browser to see if there are file types it is not accepting. If you are monitor your website through 100pulse, we will intimate whenever you encounter 406 status code error through e-mail or Short message service.