当我尝试在 Jenkins 服务器上安装任何插件时，浏览器中出现以下错误。我可以看到插件列表Available。当我选择任何插件并单击Install without restart或 时，都会发生错误Download now and install after restart。
Chrome 中的错误：
This page isn’t working
xxxxxxx didn’t send any data.
ERR_EMPTY_RESPONSE
xxxxxxx 代表服务器名称。
Firefox 中的错误：
The connection was reset
The connection to the server was reset while the page was loading.
The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer’s network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
浏览器地址栏显示的URL：
http://xxxxxxx:8080/pluginManager/install
我在这里遗漏了什么？
我的环境：
Server OS: RHEL7
Jenkins version: Jenkins ver. 2.121.1
JDK version: OpenJDK Runtime Environment (build 1.8.0_171-b10)
OpenJDK 64-Bit Server VM (build 25.171-b10, mixed mode)