linux中远程连接（如SSH）出现someone could be eavesdropping on you right now的解决办法

今天用SSH连接我的远程主机，出现了以下错误：

IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!

Someone could be eavesdropping on you right now (man-in-the-middle attack)!

网上查了一下，用

rm -rf .ssh/known_hosts

删除主机列表就行了。