Question: I am trying to connect to a Windows based SSTP VPN network. I am using OS X Yosemite, I was wondering if there is any solution that can allow me to connect to a SSTP based VPN. 

For the record, I have already tried using EasyVPN, iSSTP, iSSTP2. all of which failed to connect, and they all seem to be not supported anymore.

Answer: 
Please check my answer here - <https://stackoverflow.com/questions/40590806/windows-sstp-vpn-connect-from-mac/40590807#40590807>

There I explained how I connect Mac to Windows SSTP (probably threads should be merged)
Your best bet is [iSSTP - a SSTP client for Mac OS X](https://www.axot.org/2015/03/03/isstp-a-sstp-client-for-mac-osx/).

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> This is a sstp GUI client for Mac, use a modified sstp-client as backend which support server-name TLS extension. Some servers(ex: \*.vpnazure.net) require server-name, otherwise the sstp connection will be rejected.
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The reason for being the best bet is that this is the only one (to my knowledge) SSTP client for Mac up to now.