If you have a trouble with using SVPN service,
please check whether your windows OS version is 1809, and
Please use the latest version of windows update KB4493509;Build 17763.437(or more).
※ This is only related with Windows 10.

□ Symptom
It is said that it is all a bug of that version, such as not connected to the VPN or
not being connected to the Internet after the VPN is connected.

□ Checking your windows OS update version
① Win + R. Open up the run command with the Win + R. key combo.
② Launch winver. Simply type in winver into the run command text box and hit OK.
③ You can see a screen revealing the OS version. Please check the version is '1809'.

□ Windows Update Manual Guide
① Open Settings app and go to Update and Security.
② Click 'Update & Security' → 'Windows Update'
③ Select 'Check for Updates' button.
(Please check the version whether it is KB4493509;Build 17763.437(or more) or not.)
④ Then the update will be started automatically.