The 417 status code means that the server was unable to properly complete the request. The server cannot meet the requirements of the Expect request-header field.

The Expect request-header field is used to indicate that particular server behaviors are required by the client. The server could not execute these expectations. One of the headers sent to the server, the "Expect" header, indicated an expectation the server could not meet.

The problem can only be resolved by examining what the client is trying to do and then discussing with your ISP why the Web server fails the 'Expect' request sent by the client system. If you are monitor your website through 100pulse, we will intimate whenever you encounter 417 status code error through e-mail or Short message service.