I am setting up the RouterOS in a VM environtment and with only one active interface I can get DNS and Proxy working perfectly.
However , Once I enable Hotspot - everything stops 
/ip address add address=192.168.103.253/24 interface=ether1
/ip route add dst-address=0.0.0.0/0 gateway=192.168.103.1
/ip dns set servers=192.232.128.XXX,192.232.128.XXX
/ip dns set cache-max-ttl 3d
/ip dns set allow-remote-requests yes
/user add name=superuser password=p@55w0rd group=full
/user remove admin
/system clock set time-zone-name Australia/Melbourne
/system ntp client set primary-ntp 192.232.128.XXX
/system ntp client set enabled yes
/ip firewall nat add in-interface=ether1 dst-port=80 protocol=tcp action=redirect to-ports=8080 chain=dstnat
/ip proxy set enabled=yes port=8080
/ip proxy set max-cache-size=20000KiB
/ip proxy set cache-on-disk=yes
/ip proxy set always-from-cache=yes
I have an existing WiFi Infrastructure, and I just need to add the functionality of forcing the first web page you ever get when you first ‘attach’ of being one I control…
Please Help , Many Thanks.