@terziyski Thank you very much! I am sure that I use my AX10 open that web site 3~4 months ago without the problem. I didn't change anything after then on the router. Maybe my internet provider...

@terziyski thank you! my settings are same as what you recommended. I have to use Internet Explorer to browse this website. that website only support Internet Explorer by now. I will try to upgrade...

I have a tp-link router. Model: Archer AX10(US) Ver 1.26 Firmware Version: 1.1.1 Build 20201116 Rel. 57022(5553) When I use ie to browser a website, I got the error: "Can’t connect securely to this...