Server Crashed for 5000 Users

By "Mango DB" do you mean MongoDB Atlas? Here are some things you need to look into:

• What's the load on the database, is it reaching any CPU, memory or storage limits? Does it autoscale (I'm not familiar with this DB)?
• What's the load on your NodeJS Back-end which I think you mean is running in EC2? Does it autoscale? Is it behind a load balancer?
• Same for your Angular Web Servers.
• Where are the servers (all 3 tiers) loggin, and what errors are in the logs?

Forgive me if I'm mistaken but when I asked for metrics and logs you sent Billing information which makes me think you've been dropped in the deep end here and really don't know much about AWS or the application. I think you're going to have to do some basic training on both before you can get anywhere; bringing you up to speed that far is beyond the scope of this forum. Sorry if that sounds blunt.

Best of luck!

Hello Skinsman,

Thanks for making an effort to reply.

**What's the architecture? **

We have developed our backend in Node J and the front end in the Agular Platform.

Hosted our Application in AWS Server, using Mango DB to fetch the Database.

AWS services you're using? I have included Our Mango DB Plan and AWS Plan.

** What do your CloudWatch metrics and your logs indicate that happened?**

User Login Attempt

I hope I have given all the details you requested. Please let me know if you need anything else.