jimasek wrote m1155 - what kind of ISP do you have? I told earlier that some of ISP (3G and LTE) has access restriction on WAN address. BASE (Belgium). The named it 3,75G because it's coverage isn't...

Installing the beta does not solve the problem for me.... any other options ?

I've installed the "mr3420v2_en_3_13_31_up_boot(130128)Beta" but it doesn't solve the problem.not forwarding ports. The TpLink support dont have any solution too...(?)