idrac9内网登录正常公网映射访问异常出

错误内容：

Unknown Reason
Your browser sent a request that this server could not understand
Additionally, a 400 Bad Request error was encountered while trying to use an ErrorDocument to handle the request

解决方法：

The webserver in iDRAC9 firmware version 5.10.00.00 enforces an HTTP / HTTPS Host Header check by default     ，应该是这个版本启动了Host Header check

默认情况下，iDRAC9 将检查 HTTP/HTTPS 主机标头，并与定义的“DNSRacName”和“DNSDomainName”进行比较。当值不匹配时，iDRAC 将拒绝 HTTP/HTTPS 连接。在 iDRAC9 5.10.00.00 中，可以通过以下 RACADM 命令禁用此主机标头强制检查。
#Disable host header check


racadm set idrac.webserver.HostHeaderCheck 0

ssh登录：

ssh root@idrac地址，输入idrace账号密码