We were having these issues with our staff at an office that we were migrating off FortiGate VPN. The FortiGate VPN had made some changes to the WAN mini-port so I did the following steps: To fix this problem, uninstall and reinstall WAN Miniport drivers. STEP 1 Uninstall and reinstall WAN Miniport drivers Press the Windows + R keys to open the Run dialog box. Type in the following text, and then press Enter. devmgmt.msc In the Device Manager window, double-click Network adapters to expand it. Under Network adapters, double click WAN Miniport drivers (IKEv2) to open driver properties. If you cannot find WAN Miniport drivers (IKEv2) under Network adapter, from the top menu bar, click View > Show hidden devices. On the Driver tab, click Uninstall or Uninstall Device. Follow the on-screen instructions. Repeat lines 4 to 6 to remove the following drivers: WAN Miniport drivers (IP) WAN Miniport drivers (IPv6) Follow the on-screen instructions and remove the WAN Miniport and TAP drivers. In the Device Manager window, from the top toolbar, click Action and then click Scan for hardware changes. Follow the on-screen instructions to install WAN Miniport device drivers. STEP 2 Reset network adapter and TCP/IP stack Press the Windows + R keys to open the Run dialog box. Type in the following text, and then press Enter. cmd In the Command Prompt window, type the following and press Enter: netsh winsock reset When the Winsock reset is complete, the message "Winsock reset completed successfully" appears in the Command Prompt window. In the Command Prompt window, type the following and press Enter: netsh int ipv4 reset Exit all programs and restart your computer.
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