Cannot establish SSH connection to CentOS container.

[Andy Melton]

I'm trying to figure out an SSH problem. I can establish an SSH connection from the Proxmox host to a Linux container. I can establish an SSH connection from the container to the host. I can establish an SSH connection from a Windows client to the Proxmox host. However, I cannot establish a connection from Windows client to Linux container running on Proxmox host. I can establish an SSH connection from Windows client to Proxmox host and then establish another SSH session to the Linux container. I can even use SCP to transfer files between the Proxmox host and container. I want to be able to SSH directly into the container.

I turned off the Proxmox firewall, no change. The container does not have the firewall enabled.

The container I am using is the CentOS 7 default template (centos-7-default_20160205_amd64.tar.xz). I did manually install openssh-server as well as iptables.

I edited the sshd_config file to explicitly allow root logon, but there was no change.

I copied the sshd_config file from the Proxmox host to the container. I then restarted the sshd service and was still able to connect. I restarted the container for good measure and was still able to connect as described above.

Since I can establish an SSH connection from host to container and in reverse, but not from a Windows client or my Android phone I am convinced this has to be a firewall problem, but I don't know where.