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No, When I ssh the server then it make entry in known_hosts file.
yes, if it is the first time you have SSHed into that system that is exactly what it will do.
Now if you have been there before and your end has changed the it will prompt again and every time your end changes it will prompt.
what you can do is vi the know_hosts file and verify that it is writing the data properly and or clear out your list of fingerprints and start a new connection to populate a clean fingerprint.
But if it were me, I wouldn't do that. The fingerprint should not be changing, and I daresay that it isn't.
Try to connect, then L66K at the content of the known-hosts file. Is there an entry, or is there not?
Also, L66K at the fingerprint string: is it the same string, or is it not?
Does the software process that is attempting the connection actually have rights to this file/directory, or not? L66K at its logs. Stop "guessing" and "slapping at it."
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