Azure云服务上的503错误

Question

We use Azure and have problems with our Cloud Service last two days. We get 503 error on site. It looks like one of web-roles reboots sometimes. But in dashboard all of them works fine. Application Insight and Logs doesn't show any problems. CPU, Memory, Exception rate - all OK.

But I found one interesting moment. SQL queries average time grew to 5 seconds. But I checked it on database, it worked normal. This means that 5 seconds is not execution time but connection. It looks too much for trace inside data center.

Does anyone have any ideas how I can find a solution of this problem?

Answer 1

When your app generates a lot of exceptions in short time IIS stops application pool and you get 503 error. For more details google for "IIS Rapid Protection".