Essl epush server setup issue on amazon ec2 centos

I am trying to install iclock (epush server from esslsecurity) and it is working fine on my local system.

But when i am trying to install it on our production server (Amazon ec2 centos), While login into iclock, I am getting error 404 in network log.

While installing it on production server I followed below mentioned steps.

1. Installation of apache tomcat 8.5.50 version (https://tomcat.apache.org/download-80.cgi)
2. Downloading iclock binaries from http://esslsecurity.com/catalog/softwares-0 -> epush server -> ePush Server Linux & Windows
3. keeping iclock folder in /opt/tomcat/webapps/iclock
4. starting tomcat using command /opt/tomcat/bin/catalina.sh start

I also tried it to install it on local system using same process and on local its workign fine.

Production URL : http://3.6.126.56:8080/iclock

Please find screenshots below