ssh to localhost fails with "Connection closed by 127.0.0.1 port 4444"

[yuvalatzmon]

Hello,

I'm having trouble SSHing into a container. Here's a simplified example using ssh to localhost:

enroot import 'docker://nvcr.io#nvidia/pytorch:23.10-py3' && enroot create --name torch2310 nvidia+pytorch+23.10-py3.sqsh && enroot start --root --rw torch2310 /bin/bash -c 'cd ~ && mkdir -p ~/.ssh && apt update && apt install openssh-server sudo -y && echo "PermitRootLogin yes" >> /etc/ssh/sshd_config && echo "AuthorizedKeysFile .ssh/authorized_keys" >> /etc/ssh/sshd_config && echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config && echo "LogLevel VERBOSE" >> /etc/ssh/sshd_config && echo "GatewayPorts yes" >> /etc/ssh/sshd_config && echo "Port 4444" >> /etc/ssh/sshd_config && service ssh restart && ssh-keygen -q -N "" -f /root/.ssh/id_rsa && cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys && ssh -o StrictHostKeyChecking=no -p 4444 localhost echo SUCCESS'

SSHing to localhost fails with the error message

Connection closed by 127.0.0.1 port 4444.

The same command runs successfully using a docker container

docker run --net=host -v --rm -it nvcr.io/nvidia/pytorch:23.10-py3 /bin/bash -c 'cd ~ && mkdir -p ~/.ssh && apt update && apt install openssh-server sudo -y && echo "PermitRootLogin yes" >> /etc/ssh/sshd_config && echo "AuthorizedKeysFile .ssh/authorized_keys" >> /etc/ssh/sshd_config && echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config && echo "LogLevel VERBOSE" >> /etc/ssh/sshd_config && echo "GatewayPorts yes" >> /etc/ssh/sshd_config && echo "Port 4444" >> /etc/ssh/sshd_config && service ssh restart && ssh-keygen -q -N "" -f /root/.ssh/id_rsa && cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys && ssh -o StrictHostKeyChecking=no -p 4444 localhost echo SUCCESS'

Warning: Permanently added ‘[localhost]:4444’ (ECDSA) to the list of known hosts.
SUCCESS

[3XX0]

See #92