I've read this forum and there are some topics. But those do not answer my question.

First I created a NAT rule to open camera WEB access. It is configured on port 80 inside a camera. So I access it through port 8080 and it works fine.

Now Webcam server on port 8000. I create absolutely the same rule, but when I use iVMS4500 mobile app it do not want to connect.

I thought maybe I've entered something wrong, but when I change IP/Domain to local address it works fine. When I switch to public address it says error to connect. I have no idea what did I do wrong here. Maybe protocol has to be not TCP but some other one?

CRS1

I think first rule is problem, app exepcts 80 to be web port, yet you redirected it to 8080, try for test change it from 8080 to original 80.

Also you may need 554 UDP/TCP for RSTP stream.

Try also forward UDP of that 8000 for test.

It's OK with dst-nat rules. You don't need 554/tcp or 8000/udp for iVMS application.
How do you connect to external address? From inside the LAN? If so, you need additional hairpin-nat rule.

You know you can always use the cloud right ?
But since you want to port forward, i want to ask a few questions.
Do you have a public IP configured on your router ?
You use a DNS name ? If yes do you get a responce when you ping that name ?
Finally, as for the config you posted, no need to use the dst address 100.100..... just specify the in interface, it must be the wan interface.

You know you can always use the cloud right ?

Actualy I use the coud and use domain that was generated for me. But it does not work as well. This domain pings ok, to the same IP I am using. And as I've said I have port 80 woring with the same IP or cloud domain.

Do you have a public IP configured on your router ?

My public IP is dynamic

You use a DNS name ? If yes do you get a responce when you ping that name ?

No I do not

Finally, as for the config you posted, no need to use the dst address 100.100..... just specify the in interface, it must be the wan interface.

The 100.100.*** из my public dynamic address. When I use inretface it stops working even for port 80.

It's OK with dst-nat rules. You don't need 554/tcp or 8000/udp for iVMS application.
How do you connect to external address? From inside the LAN? If so, you need additional hairpin-nat rule.

I do not connect to an external address. Do you mean to my public IP? I connect it from within LAN or through my mobile operator. It makes no difference. And what does it mean "You do not need port 8000"? How is that? I am connecting mobile app not web browser access.

I think first rule is problem, app exepcts 80 to be web port, yet you redirected it to 8080, try for test change it from 8080 to original 80.

Also you may need 554 UDP/TCP for RSTP stream.

Try also forward UDP of that 8000 for test.

The rules in command are in a different order than on the form. I redirect request to port 8080 to actual port 80. I mean in the webcam or in the local network I open cam web interface on port 80. When I open public IP with port 8080 it redirects to port 80. Any way that works fine, no issues on that.

I suspected that protocol might be an issue, so I try UDP on 8000. It doe snot change anything. I also added 554 port redirect but that also did not change anything. Still no access.

My public IP is dynamic

It's OK with dst-nat rules. You don't need 554/tcp or 8000/udp for iVMS application.
How do you connect to external address? From inside the LAN? If so, you need additional hairpin-nat rule.

I do not connect to an external address. Do you mean to my public IP? I connect it from within LAN or through my mobile operator. It makes no difference. And what does it mean "You do not need port 8000"? How is that? I am connecting mobile app not web browser access.

Try also forward UDP of that 8000 for test.

I suspected that protocol might be an issue, so I try UDP on 8000. It doe snot change anything. I also added 554 port redirect but that also did not change anything. Still no access.

Yes, I mean public IP. And I wrote, you don't need 8000/udp (ivicask suggestion), only 8000/tcp (you already tried it).
Are you sure port 8000 is reachable from Internet (not filtered by provider)? Check if packets are coming to this port.

Actualy I use the coud and use domain that was generated for me

A cloud device does not need a DNS. I guess you mean the manufacturer gives you a free DNS to use, but this is not what i mean.

/ip firewall Nat export