At first, please update to the latest firmware version, because old firmware can’t support this.

For some system vim have small issues, especially in input mode. Easy way to fix – using no compatible mode.

By default, SoftEther virtual network interface under Windows has higher priority and when you connect to VPN – all external traffic routed over VPN gateway. If need access only to internal VPN network, need to change metric on interface.

Sometimes need to verify if server is real support HTTP 2.0

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Sometimes, when using self-signed certificate need to disable verification for debug.