Installation for Intranet use only.

Hi,
I've been trying to deploy a webhost server at local LAN for development purposes.

i want to create different domains for local working like app1.dev and website1.dev so that i can host different projecs in my local LAN environment and can access only in that LAN.

I am on a Centos 6.10 VM (using exsi wmware) (on my own private physical server Dell PowerEdge-R710)

i have gone through the installation and able to access the cwp on ports 2030 and 2031 both

i was able to install php 7.1 as well

2ndly, i have also activated the NAT'ed mode and has put the machine LAN Ip 192.168.88.212 and has rebuilt the apache virtual hosts (and public IP in shared IP field , as indicated in the instruction link in cwp)

in my mikrotik router i have added a static DNS entry to resolve <anything>.dev to 192.168.88.212 IP

now when i create a domain say ashif.dev the account is created and when i try to open in browser

it automatically redirects from http://ashif.dev to https://ashif.dev and says SSL HSTS error self signed. can not allow to open website.

if i try to open http(s)://ashif.dev:208(2/3) it gives me login page and whn i login it gives me a 404 error there.

have been struggling since several days to make is possible.

thanking all in anticipation for time to read and helping me out.