colucci-web.it

Most probably the huawei ROM has a custom settings to grant to the app the permission to start at boot-up.
Please, try to search on google Huawei autostart manager

• New global options section "Quick tiles"
  this section allow to change the VPN associated with quick settings tiles without remove/add the tile

• Minor improvements/bug fixes

Android not allow to use the VPN through tethering.
Maybe you can find some workaround on Google, but surely it require root access because the workaround must change iptables/advanced routing configuration.

Please, try to follow these steps:

• edit the VPN profile

• tap on "App filter"

• set the mode to "The VPN can be used by any apps, except for the following apps"

• add the Google Play Store app to the list

• save the changes

Normally the configuration of the SSTP is very simple and require only the IP address and user/password.

Anyway, without the error I cannot help you.

P.S.
The advertisement of VPN providers is not allowed, so I removed the link from your previous post

Please, can you tell me the error?

The app assing only the local address received by the server, so the other local address is assigned by the OS.
Yes, in my opinion the problem is on the Samsung ROM

The SSTP protocol configure only the local IPv6 address (fe80::X:X:X:X:X:X:X:X). The global addresses should be configured by the OS using the Router Advertisement messages.
So, seem that your device doesn't configure the global addresses correctly.

Both EAP-MS-CHAPV2 and MS-CHAPV2 are based on username and password.
To use the certificate you should use EAP-TLS.
On the server side it should be called like EAP Microsoft: Smart card or other certificate