During the last years I've had various problems with MacOS SSH, but those were quickly resolved searching the net. This is now something different.
This is Mojave -system with lates updates (10.14.4). I do think though that this did begin even before updating with the latest patches.
$ ssh -V OpenSSH_7.9p1, LibreSSL 2.7.3
The error I get is:
$ ssh <host> -v ---8<---- debug1: no key from blob. pkalg ssh-rsa: invalid format ssh_dispatch_run_fatal: Connection to <host> port 22: invalid format
I've tried running without defined config-file, running with different options, but with no help. From other systems, such as Arch Linux (OpenSSH_7.9p1) and CentOS7 (OpenSSH_7.4p1) ssh'ing to the same host works well. Especially the same SSH version working on an arch linux tells me that this is something apple-related.
So what is happening now and how to fix this behaviour?