FAQ

Can't connect VPN using SSTP (windows)

Category: VPN

Due to Windows Update, VPN can't connect in some cases.
Please delete your existing VPN connection settings and reconfigure them.

The following are the delete settings.

Windows Start menu > settings > Networks > VPN

Then click on the corresponding VPN connection name and click "Delete".
Once the deletion is complete, set up the VPN again.

(Guide)
https://web.sic.shibaura-it.ac.jp/SRAS_VPN?lang=en