Apache troubleshooting issue

I have been able to resolve the issue with stapp02 and stapp03 by editing the listening port, document root, and server name.
I was able to curl both IP addresses too, but doing the same with stapp01 seems not to be working. I have also started the httpd service. what else can I do please?

Below are some of the settings i changed

ServerRoot /etc/httpd
Listen 172.16.238.10:8080
ServerName 172.16.238.10:8088
DocumentRoot /var/www/html