Gluu Server continuously giving me 503 error - Service Unavailable - amazon-ec2

I have EC2 instance (Redhat 7.* 64 bit) and I have installed gluu-server-3.0.1 on that ec2 instance.
I followed this tutorial to install the gluu-server on the ec2 instnce
Gluu-server installation (official)
I installed carefully following each and every step listed there on above link. Every step and command of the installation process was success (No problem with installation).
Finally when I visit the gluu-server link it redirects me to the correct link automatically. I visit http://example.com redirect me to https://example.com/identity but the gives me error 503.
Error
The server is temporarily unable to service your request due to
maintenance downtime or capacity problems. Please try again later.

If you want to post this question on the Gluu Support forum, you're more likely to get a response from the team.

Please increase ram and storage of your ec2 and try it.(If Gluu server required 4GB then go for 8GB EC2 instance and allot 6GB to Gluu server)

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