I'm using PPTP to connect my laptop and Surface to the corporate network. How do I connect my Nokia Lumia 920 with Windows Phone 8.1 Developer Preview to the network using PPTP?
Windows Phone 8.1 does not support PPTP VPN
According to Technet, the only VPN protocols that are supported are:
- IKEv2 - Supported natively
- SSL-VPN - Supported for third-party servers via a plug-in model
The first step is to get a VPN profile onto your phone, either by setting up a Workplace account, or by creating one manually in Settings -> VPN, and tap + and then fill in your server name or IP address, and username/password.
If your particular VPN is not available in the Type drop down, you can tap the "Download an SSL VPN app from the Store" link below to get the app for your provider (Be it SonicWall, Check Point, etc.)
I don't believe it's possible to share the VPN connection via the Internet Sharing feature - instead that shares the current Internet Connection, which your tablet (PC, etc.) can use, and connect to the VPN separately over that shared connection.