Welcome to the IDM Forum. This forum is meant as a user-to-user support mechanism where users can share knowledge and tips for all IDM software.
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The supported SSH ciphers were changed several months ago due to security concerns. You may want to try updating your problematic software to the latest version and see if that helps. If not, I'm afraid you'll have to use another program which supports the necessary ciphers. The latest versions of PuTTY and FileZilla will work.