VNC 协议我研究过，授权不友好，VNC4+以上版本只能在有限的几个 VNC 客户端上使用。

We would like to be able to support higher version, however any version of the RFB protocol over 3.8 (such as the version used by RealVNC) are proprietary. Licensing the use of the newer protocols may be cost-prohibitive - though it has been a while since I checked into it

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同时有自己写的远程会话管理器推荐： https://github.com/VShawn/PRemoteM