It is my understanding that in OpenSSH 7.x several changes regarding weak and legacy cryptography. (I ran into a similar problem upgrading OpenSSH on my home server.) Under "Potentially Incompatible Changes", this item may be to related:

* Support for ssh-dss, ssh-dss-cert-* host and user keys is disabled by default at run-time. These may be re-enabled using the instructions at http://www.openssh.com/legacy.html
The following links may be more informative:

Hope that helps.

In reply to Re: Net::SSH Protocol Error by atcroft
in thread Net::SSH Protocol Error by perlssh

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