c# - ASP.NET MVC 5 in AWS and MongoDb, 503 Service is unavaliable -

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i have web app in asp.net mvc 5 hosted in aws (elastic beanstalk). has load balancer 2 web servers (t2.medium). in other hand, have mongodb hosted in mongolab (database service) dedicated cluster plans, m1, 1.7 gb ram in aws too.

i have simple web api (called throught javascript) inserting in mongodb click events of user (log info behaviour of user in web app).

last week, had 1200 users connected @ same time, , after 10 minutes, server began response, 503. service unavaliable.

if see telemetry monitor web server in aws, fine. cpu normal (about 20%), , servers up.

i have read lot error (app pool of iis restarting because many errors in short time), in elmah log, don't find exceptions.

i don't know origin of problem, , show telemetry of mongodb.

can me please?

regards.

edit: have installed in ec2 instances windows server 2012 core edition iis 8 (no user interface)

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