Hassio web page and SSH access denied

I followed this installation Now I have access to hassio command line (on my Raspberry pi machine, the prompt looks like this: hassio>

I have found the IP address of my raspberry pi and have ping response. However, when I enter the ip address (10.24.51.138:8123) in the browser I get this message:

The following error was encountered:

Access Denied.

I can not even do SSH. I get connection refused error.

It is worth noting that this is a fresh installation. I have not done anything.