Error"HTTP Status 501 - Method ET is not defined in RFC 2068 and is not supported by the Servlet API"

When i click on URL which will direct the user to show his change packages in integrity client.

But after clicking on URL I am getting following error as

HTTP Status 501 - Method ET is not defined in RFC 2068 and is not supported by the Servlet API "

in IE browser but it work fine in Mozilla Firefox.

How to resolve this error in IE browser.