场景一：
Web服务器环境为Apache
故障现象为经过nginx反代到apache上，http正常，https下提示为“Reason: The client software did not provide a hostname using Server Name Indication (SNI), which is required to access this server.”
场景二：
Web服务器为IIS 8.5
故障现象为经过nginx反代到IIS上，http正常，https下提示“CONNECTION_RESET”，在nginx的error log上提示Connection reset by peer when handing shake。tcpdump抓包显示，nginx端向IIS端发出hello报文后，IIS直接响应RST包，连接强制结束。
