The cipher ‘aes256-cbc’ is required, but it is not available

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This error also appear when your private key is in putty format and not in open ssh format.

You can convert the key with the tool puttygen to an open ssh format private key.

This solves the Problem for me. Replaceing the Java files was not necessary in my case with netbeans 8.0.2 and Java 8_25.

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