Hi,
its good to know that you have resolved WAN_2_LAN issue.
Indeed, you are correct there is CPU saturation issue.
I also confirm that I observer hanging WebUI after upgrading to 7.05, but with 7.4.5 didn’t see such problems. It may looks like during setting up HTTP session router is breaking connection, its hard for me to say exactly.
With port-forwarding rules, it makes sense that you add it to the router, in order to have access via VPN Tunnel. Additionally, make sure you have reverse-routing in routing table for subnet you are connecting from.
I also opened up ticket for this: RUT 240 - RutOS 7.05 has very high CPU usage spiking up to 100% - #3 by Julius
Kind Regards,
Robert.