Headers of http://qlwebws.cloudapp.net/ws_sp/webservice_sp.asmx/getqlgdbver

HTTP/1.1 500 Internal Server Error
Cache-Control
private
Content-Type
text/plain; charset=utf-8
Server
Microsoft-IIS/8.5
X-AspNet-Version
4.0.30319
X-Powered-By
ASP.NET
Date
Tue, 24 Feb 2015 10:59:30 GMT
Connection
close
Content-Length
197