Error connecting via ssh. How to fix?

When connecting via ssh to an ubuntu dev, an error occurs.
Alexandr Linux-VirtualBox 4.4.0-24-generic #43-Ubuntu SMP Wed Jun 8 19:27:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
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Connecting to servers on the Internet is fine.

Connect via localhost to itself via ssh also works.

like telnet shows that the connection is.
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How to fix the connection error?
July 8th 19 at 12:11
2 answers
July 8th 19 at 12:13
Solution
You need to update PuTTY to the latest version.
July 8th 19 at 12:15
"protocol violation" - see the Protocol settings of the connection on the server and the client.

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