我們在爲web代理客戶端配置web代理偵聽器的時候會發現有一個選項叫“啓用ssl”如圖：
但是在你當啓用ssl這個功能的時候，你在瀏覽器中連接ssl的網頁的時候發現會連接不上，具體原因就是The initial connection between the Web Proxy client and the outbound Web Proxy listener must always be over HTTP
原文如下：Many people have wondered for years about the Enable SSL checkbox on the Web Proxy page. This option was also available in ISA Server 2000. This setting posed a curious problem because if you enabled this option and then tried to configure the Web browser to connect to the default SSL port on the outbound Web Proxy SSL listener, the connection attempt would fail. The reason for this is that the Web browser that is configured as a Web Proxy client cannot establish an SSL connection with the Web Proxy listener. The initial connection between the Web Proxy client and the outbound Web Proxy listener must always be over HTTP