@Virgo as I wrote; I did an intensive testing. After updating from previous firmware, things started to fail (most services I run are 80/443). Doing NAT from second router (which is where the DMZ NAT...

Hello, The latest firmware, TL-ER5120(UN)_V3_20200313, does not work with standard ports such as port 80 and port 443. When NAT-DMZ is set, everything but standard ports are relayed. Rolling back to...