Nginx Server "Forbidden Access error" and frozen browser issue

We are hosting an online examination system in a Ubuntu server 14.04 and nginx server. We tested the system with 50 users accessing the system over WiFi network using smartphones, Tab and Laptops. But while accessing the system, some browsers got frozen for longer duration and some got forbidden access error msg but got resolved when pressed refresh. What can be the possible issues?

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Hi @gavilan,

A virtual server at DigitalOcean is called a Droplet (a drop in the Digital Ocean). Depending on how many concurrent users you intend to have on the server, you may be better suited to increase the size of your virtual machine to increase the RAM.

Before you change the size of the application, could you perhaps describe the application a little more? Is it PHP? or is it just simple HTML? or another language? Did you install a standard application (such as wordpress), or did you write your own? Does it have a database server?