After installing hass.io, I can not access the web page

I installed hassio and I have problem, and the problem is that port 8123 seems to be closed. But ip has been assigned from dhcp to hassio and has ping.
What should I do now this strange situation?

How long did you wait? What hardware are you installing it on?

The last time I installed 7 hours later I could not connect to it. I install hass.io on raspberry pi 3 model B+