We are currently having big problems with all wordpress.com servers returning invalid data. This is probably related to the servers returning incorrect HTTP-headers.
This error is easy to reproduce by using the following VB/ASP code:
Set http = Server.CreateObject("Msxml2.ServerXMLHTTP.6.0")
http.Open "GET", "http://www.wordpress.com", False
http.Send
The error message will be:
msxml6.dll error '80072f78': The server returned an invalid or unrecognized response
Any insights?