I received the error 0x800704D4 today when trying to help a client with their SSTP VPN issues.

While there are many causes for this error to occur this was not one of the issues I found listed so I thought I would share it as an option.

This was caused because there were not enough SSTP VPN ports free in routing and remote access.


To Resolve:

On the server (in this case SBS 2008)

Start – > Administration Tools -> Routing and remote access.

Click the + to open the site -> Right click on Ports and select properties

Highlight the Wan Miniport (SSTP) option and click Configure at the bottom -> Add the number of ports you require and click Ok.


Now try connecting the SSTP VPN connection again remotely and hopefully your issue will be resolved.