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When I trying to connect a server from other server through some batch script using WinSCP.

But when I see the error log I found below message.

The server's host key does not match the one WinSCP has in cache. This means that either the server administrator has changed the host key, the server presents different key under certain circumstance, or you have actually connected to another computer pretending to be the server.

Could you check why I am getting this error provide resolution step by step for the same.

Thanks, Venkatesh

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    I believe this questions is related to network configuration (WinSCP) rather than programming. You may have a chance to get answer at serverfault or better ask on WinSCP Support Forum Commented Aug 1, 2018 at 8:19

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Quoting WinSCP documentation:

Warning - Potential security breach!

This message, followed by “The server’s host key does not match the one WinSCP has in cache”, means that WinSCP has connected to the SSH server before, knows what its host key should be, but has found a different one.

This may mean that a malicious attacker has replaced your server with a different one, or has redirected your network connection to their own machine. On the other hand, it may simply mean that the administrator of your server has accidentally changed the key while upgrading the SSH software; this shouldn’t happen but it is unfortunately possible. Another legitimate reason for the host key change is that the address, you are connecting to, load balances to a set of SSH servers. ...

You should contact your server’s administrator and see whether they expect the host key to have changed. If so, verify the new host key in the same way as you would if it was new.

Read more about verifying host keys.

See also Verifying the host key or certificate in script.

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