有时候Nessus长时间不用，重新打开浏览器会显示：安装已过期
Installation Expired
This installation has expired. If you believe that you are seeing this screen in error, please take one of the following corrective actions:
这个时候我们需要在命令行界面更新状态码
Linux：
sudo /opt/nessus/sbin/nessuscli fetch --register 激活码重新输入用户密码就可以登录啦。
更多问题可以看官网文档