Support for ssh-rsa host key algorithm in RUT9XX Dropbear SSH client

Hello,

I’m trying to connect to an SSH server from an RUT956. This SSH server running an older ssh-rsa configuration (which cannot be changed at the moment). I was able to connect to it using the SSH client in the RUT950 using FW RUT9_R_00.07.02.7 (those are from past notes, but it was working).

That RUT950 has now been replaced with a newer RUT956, using FW RUT9M_R_00.07.09.1.

I now get this error:

ssh: Connection to xyz@10.0.0.2:22 exited: No matching algo hostkey

I’m guessing this has something to do with this post:

The issue is most likely caused by the change in SSH key generation. From the RUTX_R_00.07.04.3 update release notes:

  • Improvement
    • System
      • Removed SSH RSA key generation
      • Added SSH ECDSA key generation

I’ve seen suggestions to use these additional options on the command line (or to put them in a host-specific section in ~/.ssh/config), but these don’t seem to work with the version of Dropbear SSH provided (they seem to be for OpenSSH).

Is there a way to force it to accept those host key algorithms as a client?

Thank you.

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