0x1，安装
百度：Nessus，随意下载一个就好了.
0x2，激活
开启代理，获取register code，如图：
获取到register code，填写，进行激活，意外报错：
NOTICE: An unexpected error occurred while downloading the plugins. This could be due to a network error, lack of disk space, or something else entirely. Please take one of the following corrective actions:
Run the 'nessuscli update' command for your respective platform.
Request help from [Tenable Customer Support]
原来：在更新plugins时，没有关闭代理，从而导致报错.
0x3，更新
此时，关闭代理，使用命令行更新plugins：nessuscli update
ps：一定要保持网络畅通，因为Nessus需要下载plugins&unpacking plugins.
更新plugins完成，这样，就可以了.
访问：https://localhost:8834，如图：
进入逛逛
