To check the firewall or router settings for domain access in CentOS 7, you can follow these steps:

1. Check the status of the firewall:

 systemctl status firewalld

2. If the firewall is not running, you can skip to step 4. If it is running, proceed to step 2. Check the firewall rules:

firewall-cmd --list-all

3. This will show you the currently configured firewall rules. Look for any rules that may be blocking incoming traffic on port 80 (HTTP) or port 443 (HTTPS). If you find any rules that may be blocking incoming traffic, you can remove them using the following command:

firewall-cmd --permanent --remove-rule=<rule>

4. Replace <rule> with the rule you want to remove. Add firewall rules to allow incoming traffic on ports 80 and 443:

firewall-cmd --permanent --add-service=http
firewall-cmd --permanent --add-service=https

5. These commands will add firewall rules to allow incoming traffic on ports 80 and 443. Make sure to reload the firewall for the changes to take effect:

firewall-cmd --reload

4. Check the router settings:

Check your router’s settings to make sure that port forwarding is set up correctly for ports 80 and 443. You may need to consult your router’s documentation for instructions on how to set up port forwarding.

Once you’ve checked the firewall and router settings, try accessing your website using its domain name again. If you’re still having trouble, you may want to contact your IT support team or hosting provider for further assistance.