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I've reinstalled the QNX RTOS 6.5.0 on virtualbox of which I was able to ssh into using the following command: ssh root@127.0.0.1 -p 3022. The network settings inside my VirtualBox environment is set to NAT, and port forwarding set to:

QNX VirtualBox Network settings

When attempting to connect with -vvv flags:

$ ssh -vvv root@127.0.0.1 -p 3022
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /home/main/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "127.0.0.1" port 3022
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 127.0.0.1 [127.0.0.1] port 3022.
debug1: Connection established.
debug1: identity file /home/main/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/main/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/main/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/main/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/main/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/main/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/main/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/main/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
ssh_exchange_identification: Connection closed by remote host

On QNX I have the following options modified in /etc/ssh/sshd_config:

PermitRootLogin yes
PermitEmptyPasswords yes
Subsystem sftpd /usr/libexec/sftp-server

I am also able to ssh into my laptop via the vm, however not the other way around. I also tried ssh'ing into my laptop which works, then ssh'ing back into the vm in the same vm session and am presented with the same error.

1 Answers1

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Solved. The solution was to generate new rsa and dsa keys with:

random -t
ssh-keygen -t rsa -f /etc/ssh/ssh_host_key -b 1024
ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key

and then add sshd to the /etc/group list: sshd:x:6:root

then re-run sshd: /usr/sbin/sshd

source: How do you install an ssh server on qnx?

To extend on the above sourced solution, I found that on reboot I was no longer able to ssh into the VM. This was solved by going into /etc/rc.d/ and adding the line /usr/sbin/sshd to the rc.local file.