vpnazure and Android SSTP VPN Client

[AndroidDeveloper]

Hello,
I'm the developer of the Android SSTP VPN Client.
This client is able to connect to SoftEther servers, Windows servers and Mikrotik routers.
Instead, there is no way to connect through your relay vpnazure.net.
The SSL connection is established, but after the first packet the connection is close by your server.
The problem seem a incompatibility between the SSL implementation of your vpnazure servers and the openssl library.

The simplest way to reproduce the problem is to use the command "openssl s_client -host xxx.vpnazure.net -port 443" and send this data:

SSTP_DUPLEX_POST /sra_{BA195980-CD49-458b-9E23-C84EE0ADCD75}/ HTTP/1.1
SSTPCORRELATIONID: {00000000-D470-93C7-0000-00009100C3D1}
Content-Length: 18446744073709551615
Host: xxx.vpnazure.net

Your server should respond with:
HTTP/1.1 200
But the connection is closed without any reason.

Maybe the log of your servers can help to understand the problem...

Thank you!
Paolo

[texas_72]

For me it would be extremely advantageous to use an Android client vpnazure.
Many thanks

[cedar]

VPN Azure needs SNI to switch the session to proper VPN server.
https://en.wikipedia.org/wiki/Server_Name_Indication

[AndroidDeveloper]

you're right, the problem was the missing SNI extension. Now the app work correctly also with the vpnazure.

Thank you very much!
Paolo

[quattrolinux]

AndroidDeveloper wrote:
> you're right, the problem was the missing SNI extension. Now the app work
> correctly also with the vpnazure.
Would you mind posting a link to the application?

[AndroidDeveloper]

quattrolinux wrote:
> AndroidDeveloper wrote:
> > you're right, the problem was the missing SNI extension. Now the app work
> > correctly also with the vpnazure.
> Would you mind posting a link to the application?

Here the link:
https://play.google.com/store/apps/details?id=it.colucciweb.sstpvpnclient

[quattrolinux]

AndroidDeveloper wrote:
> Here the link:
> https://play.google.com/store/apps/deta ... pvpnclient
Thank you. Are there any plans to make it available on Amazon applications store as well?

[AndroidDeveloper]

quattrolinux wrote:
> AndroidDeveloper wrote:
> > Here the link:
> > https://play.google.com/store/apps/deta ... pvpnclient
> Thank you. Are there any plans to make it available on Amazon applications store as
> well?
You're welcome.
I'm sorry, but for the moment is not planned