No welcome page after initial installation

Hi guys,
I'm not getting the welcome page after the installation at Ubuntu 17., just display "This page isn’t working..ERR_EMPTY_RESPONSE" on Chrome, you can try it at http://35.229.160.102/

Below is my setup:

1. firewall is disabled

sudo ufw disable
Firewall stopped and disabled on system startup

2. service is up and running

xu_tomi3_gmail_com@jitsi:~$ sudo systemctl status nginx
● nginx.service - A high performance web server and a reverse proxy server
Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2018-02-21 09:25:52 UTC; 14min ago
Docs: man:nginx(8)
Process: 26083 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=0/SUCCESS)
Process: 28919 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Process: 28910 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
Main PID: 28923 (nginx)
Tasks: 2 (limit: 4915)
Memory: 2.6M
CPU: 22ms
CGroup: /system.slice/nginx.service
├─28923 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
└─28927 nginx: worker process

Feb 21 09:25:52 jitsi systemd[1]: Starting A high performance web server and a reverse proxy server...
Feb 21 09:25:52 jitsi systemd[1]: nginx.service: Failed to read PID from file /run/nginx.pid: Invalid argument
Feb 21 09:25:52 jitsi systemd[1]: Started A high performance web server and a reverse proxy server.

3. all the config is default

Any idea?