Cannot browse the Seafile after step 4

Hi I am using the URL below to install:-

Firstly I am able to browse http://113.23.216.51:8000/ on step 4

But after completed the step 5 till end (ngix, SSL & firewall) I am no longer able to browse http://113.23.216.51:8000/. I try access using Seafile desktop version also the same. Any idea how to check?

Are you familiar with the basics of webhosting, security (e.g. Firewall), network and ports?

Yes, Firewall already turn off but the same. I have this error although Phyton already installed

[root@cloud seafile]# service seafile status
Redirecting to /bin/systemctl status seafile.service
● seafile.service - Seafile Server
Loaded: loaded (/etc/systemd/system/seafile.service; enabled; vendor preset: disabled)
Active: active (exited) since Thu 2018-02-08 18:16:50 +08; 3min 41s ago
Process: 9492 ExecStop=/var/www/seafile/seafile-server/seafile.sh stop (code=exited, status=0/SUCCESS)
Process: 9512 ExecStart=/var/www/seafile/seafile-server/seafile.sh start (code=exited, status=0/SUCCESS)
Main PID: 9512 (code=exited, status=0/SUCCESS)
CGroup: /system.slice/seafile.service
├─9540 /var/www/seafile/seafile-server/seafile/bin/seafile-control…
├─9543 ccnet-server -F /var/www/seafile/conf -c /var/www/seafile/c…
├─9547 /bin/java -Xms256m -Xmx1g -Djava.awt.headless=true -XX:+Use…
└─9560 seaf-server -F /var/www/seafile/conf -c /var/www/seafile/cc…

Feb 08 18:19:48 cloud.sissonpaints.com.my python2.7[9849]: detected unhandled…
Feb 08 18:19:48 cloud.sissonpaints.com.my python2.7[9849]: can’t communicate …
Feb 08 18:19:58 cloud.sissonpaints.com.my python2.7[9860]: detected unhandled…
Feb 08 18:19:58 cloud.sissonpaints.com.my python2.7[9860]: can’t communicate …
Feb 08 18:20:08 cloud.sissonpaints.com.my python2.7[9876]: detected unhandled…
Feb 08 18:20:08 cloud.sissonpaints.com.my python2.7[9876]: can’t communicate …
Feb 08 18:20:18 cloud.sissonpaints.com.my python2.7[9888]: detected unhandled…
Feb 08 18:20:18 cloud.sissonpaints.com.my python2.7[9888]: can’t communicate …
Feb 08 18:20:28 cloud.sissonpaints.com.my python2.7[9899]: detected unhandled…
Feb 08 18:20:28 cloud.sissonpaints.com.my python2.7[9899]: can’t communicate …
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