I'm new to RouterOS, but i like it.
Today I have one very strange problem:
When i open port 80 or 443 all local internet access stop.
Opened ports work and content. Add a simple web server and Its load from other devices and networks or with mobile data or with VPN, but local internet access stop.

It's very strange because if I'm connected true VPN it's okay i have internet access.
But if i disconnect VPN then i have no internet access.

I open port with this command:
/ip firewall nat add chain=dstnat dst-port=80 action=dst-nat protocol=tcp to-address=192.168.0.74 to-port=80

When i disable this NAT Rule, all its fine and works good.

Some advice where i can search problem or any help. I cant solve this problem 2 days

first, a network diagram always help what you are trying to convey,
The other necessity is seeing the config
/export hide-sensitive file=anynameyouwish

Just ensure any public IP, or public gateway IPs are not shown (put xx.xxx )

You are natting ALL port 443/80 traffic to 192.168.0.74 (yes, including "the whole internet"). Set dst-address to your wan ip, or use dst-address-type=local

Thanks all,
i fixed it when i add "In. Interface ether1" and now works as i want.