Server's host key is not cached in the registry.

i try to ssh through putty and get this message. how can i stop this message coming again and agian when i ssh.

The Server's host key is not cached in the registry. You have no guarantee that the server is
the computer you think it is .

The server's rsa2 fingerprint is:
ssh-rsa 2048 f4:0d:f3:39:40:9c:3a:f5:36:1d:7c:71:1c:55:15:bd
if you trust this host, hit Yes to add the key to
PuTTy's cache and carry on connecting.
If you want to carry on connecting just once, without
adding the key to the cache, hit No.
if you do not trust this host, hit cancel to abandon the connection.
Who is Participating?
torimarConnect With a Mentor Commented:

If you hit 'Yes' the key should be added to the cache, and the message should not come up the next time you connect to the same server.
So did you hit 'Yes'?
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