I am using an Android 12 device and cannot access the VPN.

We have confirmed that “L2TP/IPsec VPN settings cannot be added” on devices with Android 12 installed. Since the settings created before the update are functional, we believe that this is due to a limitation in the Android settings screen. The manufacturer is currently working on this issue, so please wait for a while until the issue is resolved. We apologize for any inconvenience caused.

For more information, please refer to SoftEther VPN Notice .

I get an error message “PPP link control protocol terminated” and cannot connect.

Please try the following two things.

Protocol Permissions

  1. Open the control panel and go to Network and Internet > Network and Sharing Center > Go to “Change adapter settings .

  2. Open the properties of the registered VPN.

  3. When the property settings window appears, open the “Security” tab.

  4. Select Allow the following protocols (P) and check the following three checkboxes.

  • Unencrypted Password (PAP)(U)

  • Challenge Handshake Accreditation Protocol (CHAP)(H)

  • Microsoft CHAP Version 2 (MS-CHAP v2)

../../../_images/win11_ppp.png

  1. Go to OK and try connecting again.

Uninstalling Updates

Make sure that the following two updates are not installed on your PC.

  • KB5025305

  • KB5026372

Both of these updates are preview updates and should have been updated manually. If either one of them is installed, uninstalling the software may restore the situation.

The uninstallation procedure is as follows.

  1. From Settings, open Update and Security → Windows Update.

  2. Display update history → Open Uninstall updates in the upper left.

  3. Please check if the above two updates are in the list. If there is, right-click on the corresponding update and uninstall it.

  4. After that, restart your computer and try connecting to the VPN again.

I’m using a Windows 11 device, but I can’t connect to the VPN.

Currently, it has been confirmed that some devices running Windows 11 are unable to connect to the VPN. Please try the following method as one of the solutions.

Caution

  • This setting seems to be possible only for wired LAN. Also, since it depends on the device driver, there may be some drivers that do not allow this setting.

  • This is a temporary workaround, so please restore the settings once the issue is resolved in your OS.

  1. Open the control panel and go to Network and Internet > Network and Sharing Center > Go to “Change adapter settings .

  2. Open the properties of the currently connected network device.

  3. Select Configuration > Advanced Settings.

  4. Please set the values ​​of UDP checksum offload (IPv4) and UDP checksum offload (IPv6) to disable and try connecting again.

“The remote connection was refused because the specified username or password is not recognized or the selected protocol is not allowed by the remote access server”

In many cases, the pre-shared key is incorrect.

After pasting it in a memo app, etc., check it and save it by copying and pasting.

Spaces are also recognized as characters, so please be careful when entering them.

I can’t view campus sites even if I connect a VPN on macOS

Send all traffic over VPN connection may not be turned on.

Turn on Send all traffic through VPN connection from the options and click Create.