I have a web app in ASP.NET MVC 5 hosted in AWS (Elastic Beanstalk). It has a Load Balancer with 2 web servers (t2.medium). In the other hand, I have a Mongodb hosted in Mongolab (Database As A Service) with a Dedicated Cluster Plans, M1, with 1.7 GB RAM in AWS too.
I have a simple Web Api (called throught JavaScript) that is inserting in MongoDb click events of the user (log info about the behaviour of the user in the web app).
Last week, I had about 1200 users connected at the same time, and after about 10 minutes, the server began to response, 503. Service is unavaliable.
If a see the telemetry monitor about the web server in AWS, everything is fine. CPU normal (about 20%), and the servers are up.
I have read a lot about this error (App Pool of the IIS is restarting because too many errors in short time), but in my Elmah Log, I don't find exceptions.
I don't know where could be the origin of the problem, and I will show you the telemetry of the MongoDB.
Can anyone help me please?
Regards.
EDIT: I have installed in the EC2 instances Windows Server 2012 Core Edition with IIS 8 (no user interface)
