Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have:
how can I SSH to my system, if SSH doesn't work? ( see my short problem description )
after some wait time, the system is accessible by SSH and HTTP again; don't know why, just did several reboots after doing minor changes to /etc/config/firewall and /etc/config/network.