Install DB Server PosgreSQL 
postgresql-9.6.1-1-windows-x64.

After Install I change number standard port to 84.
In postgresql.conf

```
port = 84               # 5433 (change requires restart)

```

I restarted service and new port working.

After I try to connected DB Server by pgAdmin4.

But when I change Connection Port pgAdmin4 wrote ERROR

[![enter image description here](https://i.stack.imgur.com/2Tvay.png)](https://i.stack.imgur.com/2Tvay.png)

Can I connected to DB with port less 1024?