Why can't I access to erpnext site?

I have deployed my erpnext site on ubuntu at oracle cloud instance. It was deployed on 17.10.2022.
I was able to access it with using domain name, or http://ip:80 .

Currently I can access the site? How can I access it?

There a multiple reasons:
Firewall at Oracle Cloud is blocking it.

your IP changed and you haven’t updated your DNS record:
your domain is resolving to a different IP address compared
to the partial IP you have in your question. (17.10.2022 is not a valid IP).

geekPro:Downloads eric$ telnet erp.technometrics.net 80

Trying 152.69.213.115…
telnet: connect to address 152.69.213.115: Connection refused
telnet: Unable to connect to remote host
geekPro:Downloads eric$ telnet erp.technometrics.net 8000
Trying 152.69.213.115…
telnet: connect to address 152.69.213.115: Connection refused
telnet: Unable to connect to remote host
geekPro:Downloads eric$ telnet erp.technometrics.net 443
Trying 152.69.213.115…
telnet: connect to address 152.69.213.115: Connection refused
telnet: Unable to connect to remote host