[Bug 3786] openssh client no longer connects to dropbear server

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Wed Jun 4 18:22:49 AEST 2025


https://bugzilla.mindrot.org/show_bug.cgi?id=3786

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
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                 CC|                            |dtucker at dtucker.net

--- Comment #2 from Darren Tucker <dtucker at dtucker.net> ---
If you enable debugging on the clie(In reply to Nikola from comment #0)
> As of version 9.9 the client does not connect to dropbear running on
> OpenWRT.

Which version of Dropbear?

> With client 9.8 I am able to connect.
> 
> $ ./ssh root at 192.168.0.1
> ssh_dispatch_run_fatal: Connection to 192.168.0.1 port 22: error in
> libcrypto

If you add "-vvv" you should at least see what algorithms it's trying
to (and failing to) enable.

> Host 192.168.0.1
>     PubkeyAcceptedAlgorithms +ssh-rsa
>     HostkeyAlgorithms +ssh-rsa

My guess it's the SHA1 that ssh-rsa uses.  Modern Dropbears support
some of the the RSA SHA2 variants (rsa-sha2-256) so if yours does I'd
suggest trying that.

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