you could post the configuration screenshots of virtual server or DMZ here. I'd like to have a check. BTW, what the internal server IP is?

what do you mean by "mapped ports"? do you mean you wanna open ports for a server? And I got two document for ya on their official website. https://www.tp-link.com/en/faq-134.html and...

Another attempt, keep your settings. When WAN1 is offline and WAN2 is online, you mean cann't get online. Now set your PC's dns server as 8.8.8.8. If you could get Internet?

I think maybe it comes to dns issue. Why not configure wan1's DNS server as 8.8.8.8/ 8.8.4.4 and have a try.

need add a ACL allow entry for virtual server. I found an article on their official website which may be helpful. https://www.tp-link.com/en/faq-2026.html what hardware version is your TL-ER6020? you...

http://www.tp-link.com/en/download/T....html#Firmware I import the latest FW 180117 and it runs perfect for static routing