Why is port 80 (mysticism) not forwarded after the power is turned off?

Question

network hardware

There is an ip camera, a Tenda AC1200 (AC6) router and a white ip. I wanted to access the web interface of the camera remotely. I set up a virtual server on the router (it's called that there) and made the camera's ip address 192.168.1.108 with port 80 redirected to port 80. I also made an ip camera with port 37777 to redirect to 37777 (mobile application port).

Everything works at the beginning. I access the external ip and immediately get to the camera, but then the light goes out on the object and after turning it on I can’t get to port 80. It doesn't even ping. At that time, there was a computer at the facility to which I connected (not RDP, but AnyDesk) and rebooted it through the router's web interface. It did not help, however, there was access to the ip camera through a remote PC. When he himself arrived, he rebooted the router by turning it off from the outlet for 10 minutes and (suddenly) everything worked.

funny moment

Ещё забавный момент был до перезагрузки. Я внутри сети обратился к внешнему адресу и камера открылась, а когда к этому же ip обращаюсь через, условно, мобильный интернет - ничего нет. Вероятно маршрутизатор мухлюет и подсовывает мне локальный под видом внешнего

After that, history repeated itself. A light flashed on the object - access to the camera is lost. It is treated only by turning off the router from the outlet for 10 minutes. If I pull it out for 10 seconds - it does not help.

I have another Tenda router (cheaper model) and there I did the same thing: I forwarded ports 80 and 37777. Everything worked all day, I specially pulled it out of the socket in order to achieve a shutdown: everything is fine, there are no problems. Until I repeated this action again before exiting and that's it, there is no access to port 80. The funny thing is that now, for the sake of interest, I checked the mobile application and everything works there. That is, port 80 is disabled.

About UPnP

UPnP тоже себя странно повёл. На камере есть такая функция. Я её включил, но почему-то пробросился только 37777 и 37778 порт, а 80 с надписью ошибка. Взял другую Tenda и там UPnP заработал, но с переменным успехом, то есть доступ к ip происходит через раз: то есть, то нет. Но UPnP вообще не мой вариант, потому что тут виновных в не работе становится сразу двое: либо это маршрутизатор глюканул и доступ не дал, либо это камера глюканула и доступ не дала. Поэтому ручная проброска портов более надёжный вариант

I have checks for both routers, the warranty has not expired yet. Tell me, is this a marriage of routers? And if so, how can I prove it to them? And if not, what is the reason for these strange failures?

I didn't buy both routers. I condemn the purchase

Answer 1

Apparently there is some kind of "dirt" in the routing table. Turning off the router - resets this table.
Change the port from 80 to (for example, as I do 8080>> 80) Check, I think everything will be ok.
UPnP fails because there already IS a physical port forwarding configured. UPnP in such a scheme must be turned off
. With such constant 220v shutdowns, you will ruin the equipment. and a camera and a router and a PC. Install an uninterruptible, otherwise there will be problems