Post method fails when Kerberos Authentication is enabled

[_AnsHUMAN_]

I have fired a query on to a webservice using the GET method. Now the GET method has some limitations relating to the size of the query and the data that could be passed with it. So I thought about shifting to the use of POST method. But the POST method fails when trying to connect to the webservice returning an error : 500 Internal Server Error. Any ideas how can I resolve the problem of using the POST method with the Kerberos authentication enabled. PS: I tried googling for a solution and found this link[^] which says to disable the authentication and this is what I don't want to do as this would create a security hole. :~ (I use MSXML2)

Somethings seem HARD to do, until we know how to do them. ;-)_AnShUmAn_