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How can I disable security alerts like "The server's host key is not cached in registry, bla-bla-bla", "host identity is changed, there is man-in-the middle", etc

They are needless in cloud hosting environment, where a lot of new server instances appear. And also, it is quite normal if there eventually will be a new server on the same IP.

In linux ssh client I have done it with the following lines in my .bashrc:

alias ssh='ssh -o "StrictHostKeyChecking no" -o "UserKnownHostsFile=/dev/null" -o "CheckHostIP=no"'
alias scp='scp -o "StrictHostKeyChecking no" -o "UserKnownHostsFile=/dev/null" -o "CheckHostIP=no"'
But how to do it in putty?

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migrated from Feb 12 '10 at 21:53

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3 Answers 3

There doesn't seem to be any hope:

No, there isn't. And there won't be. Even if you write it yourself and send us the patch, we won't accept it.

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Hm. Maybe a 3rd party launcher... – Anonymous Feb 12 '10 at 21:31

I use AutoHotkey to create a script that runs in the background and scans for any particular warning popups that I don't care about, closing them automatically.

    SetTimer, ClosePopups, 100  ; Check every 1/10 of a second

    ; Putty popup definition
    IfWinExist, PuTTY Security Alert
        WinActivate PuTTY Security Alert
        Send !y ; Press Alt+Y

    ; Here's another example of a popup definition, for reference
    IfWinExist, Cisco AnyConnect Secure Mobility Client
        WinGetText, output, Cisco AnyConnect Secure Mobility Client
        if output contains Connecting to this server may result in a severe security compromise
            WinActivate Cisco AnyConnect Secure Mobility Client
            Send {Tab}{Space}

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After much searching, found the answer here:

echo y | ssh -pw yourpassword

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