OpenSSH 6.8 supports the hostkey rotation feature. The details are as below site.
However, Tera Term can not connect to the server because Tera Term(TTSSH)
does not support this feature. So, an error dialog will be shown on connection.
Fortunately, I have already implemented this feature in the latest reposity.
I have uploaded below archive supporting the feature.
Above Tera Term will show a confirmation message when a user connects to the
remote server because the ssh_known_hosts file updates to the latest hostkeys.
So, I make below confirmation message in English. Would you please correct
this sentence if the message contains any mistake?
I am looking forward to hearing from you.
Are you sure you want to accept updated hostkeys?
A user has been received complete hostkeys from a remote server.
Your known_hosts file can be updated to the latest public hostkeys
because the file does not contain in the following keys: