Set up pptpd VPN in Windows Azure

We know now we can set up the L2TP/SSTP VPN server on Windows Azure from this link:

http://blogs.msdn.com/b/notime/archive/2013/06/01/how-to-configure-windows-azure-server-2012-as-an-sstp-vpn-provider.aspx

And the PPTP is still not supported due to the GRE protocol.

But the Amazon AWS can use the pptpd on Linux:

http://www.yzhang.net/blog/2013-03-07-pptp-vpn-ec2.html

So here I try to set up the pptpd on Centos by Windows Azure.

But something wrong still exist, now I can sucessfully start the pptpd service and the 1723 port can be accessed, but when I try to connect from my Windows 7 Clident, with the 619 error.

Here I check the log in my VPN server, with the messages:

So I don't know whether still the GRE issue, or why Amazon AWS can support pptpd?

Image may be NSFW.
Clik here to view.

Asuka from ITECN