title: ASP.NET MVC 5 in AWS and MongoDb, 503 Service is unavaliable
body: <p>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.</p>
  
  <p>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).</p>
  
  <p>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.</p>
  
  <p>If a see the telemetry monitor about the web server in AWS, everything is fine. CPU normal (about 20%), and the servers are up. </p>
  
  <p>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.</p>
  
  <p>I don't know where could be the origin of the problem, and I will show you the telemetry of the MongoDB.</p>
  
  <p>Can anyone help me please?</p>
  
  <p>Regards.</p>
  
  <p><strong>EDIT:</strong> I have installed in the EC2 instances Windows Server 2012 Core Edition with IIS 8 (no user interface)</p>
  
  <p><img src="https://i.stack.imgur.com/DkWl8.jpg" alt="enter image description here"></p>