SFTP + SSH work through NuSphere. How to fix Key verification error?

Question

PHP

When working with the server via SSH or when working via SFTP, I have an error:
*** Connection has been closed ***
*** Key verification failed for server_host_key ***
Connection Failed.
I looked on the Internet, but how to fix it is not written.
Has anyone experienced this? Maybe he knows how to fix it?
I have 2 servers and I need to work with both of them.
It turns out to connect only to 1 and only after restarting the program.
Met who?

Answer 1

what operating system?
in general, this error means that in the file ~/.ssh/known_hosts (in Unix) the key of the remote host does not match the one provided by the server. Clean the file - or delete the entry with the server name from it.