hello all, i would appreciate any giving help in regard to this router since we upgraded the router to the newest firmware on the website can't login to the router web interface via the port 80 getting 502 gateway error I've tried to put the firmware via the tftp but that didn't help that's not that big problem as i managed to login to it using the port 8443 but after configuring the wan interface and the router starts to have IP the web interface go's down again not accessible via 80 or 443 or 8080 or 8443 on the other hand the ssh works fine the internet from the router is fine with no issues we need the web interface to be working for the easy manage , anyone managed to fix this please to tell me what to do as i can't even find the old firmware files because it has been removed noting that at the moment we remoe the wan cable the router web interface back to function. thanks for your help