Unable to install on Raspberry

Hi,
I flash hassio to a SD card using Etcher. Next I connect my Raspberry Pi (3B+) by cable, and go to http://:8123

For a moment I will see the Preparing Hass.io page, but a few seconds later I’ll get the error message “Unable to connect”.

Even though it says unable to connect I’m still able to ping the Raspberry.

I’ve tried several times with cable (Re-flashed image several times), but also by using wireless. I’m using an official Raspberry Pi power supply.

Anyone got an idea what this might be? I’ve tried turning off my firewall by the way.

Thanks in advance!

Trond

It should be I go to http://IP:8123