Tomcat server suddenly down on vps - vps

I'm trying to hosting my project on digital ocean vps.
I used tomcat 8, jdk 1.8.
My environment setting is
Before I deploy my project, the tomcat server has no issue. Even when my project was deployed.
But when I access my project URL, i can't access and tomcat server can't access no more. I mean, tomcat home, manager-GUI etc.
Note. My Project has no issue in my local CentOS Server. Can run successfully.
My VPS setting is
Server - Digital Ocean
OS - CentOS 7
Processor - 1 Core
Memory - 512 MB
Storage - 20 GB ssd

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why my laravel project is slower on local network than shared host?

I have encountered the odd problem in my project, my project works very fine on the shared host based on the Cpanel. however, on the local network of the organization, it is very slow.
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I have experienced this, in my case it is due to a lot of CDN usage. Happened to my office project. As an alternative, I think using webpack and reducing CDN is an option.
Sorry I don't have enough reputation yet to reply via comments

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