Из https://github.com/libapps/libapps-mirror/blob/master/nassh/doc/faq.txt#L460:
If you know the index of the offending host entry (it's usually reported by ssh if the connection fails) you can open the JavaScript console and type... term_.command.removeKnownHostByIndex(index) Replace index with the numeric, one-based host index. If you don't know the index, or you'd like to clear all known hosts, type... term_.command.removeAllKnownHosts()
or
Как удалить запись об отпечатке известного хоста (известный_хост)?
