Eugene Pankov / Профиль - Комментарии / Ajenti

See which process took the port with netstat -tnlp | grep 80

Ajenti V only supports NGINX.

NGINX

Ajenti V requires NGINX, Ajenti does not.

"It works" - страница по умолчанию работающего Apache. Либо не удален, либо до сих пор работает.

Ajenti-V? Удалите Apache.

Is Courier authd running? Are permissions on the folder ok? Is SELinux disabled?

See /var/log/exim4/mainlog for more info

I'd speculate that you have an /etc/hosts entry which maps vn137.webnetvn.com to a non-public IP.

No, it's not required, e.g.: https://104.236.18.21:8000/

Panel opens up just fine at https://webnetvn.com:8000/

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