SSH to LXC from server node works but not from another LAN PC with "Permission denied" error

[Telstar]

Really new to Proxmox but very existed after installed it on one of my home PCs and saw it up and running. The server node IP is 192.168.0.50.

I have also created a Ubuntu 22.04 LXC (no firewall) which has IP 192.168.0.51 and installed Nginx on it. Now I can access Nginx default page at http://192.168.0.51 from another home device.

In Proxmox server node shell, I can SSH to LXC with "ssh validuser@192.168.0.51" command and that user's password, however I can't SSH to LXC from another windows home PC (IP 192.168.0.22) and get below error message:

> ssh validuser@192.168.0.51
> ssh: connect to host 192.168.0.51 port 22: Permission denied

A side note is that I can ssh to my cloud vps from that windows pc.

In Proxmox, the firewall settings are:

Datacenter:


Node:


LXC:


Node Network setting:


LXC network setting:


I have done some researched and spent time trying different settings, e.g. updating sshd_config, ufw, iptables, changing Proxmox Firewall setting, but all no avail.

Is this a network or firewall issue? Is there anything else I can check/try?

Great thanks.