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HTTP 503 Errors under Load
Here is the scenario :
.Net Asp website
Split accross 3 tiers (Presentation, Business Logic, SQL)
When under load the site scales to a point where the response starts to degrade. Degradation is to the whole website hence thinking that the problem is hardware/OS or iis configuration bound as opposed to application bound.
Soon after response times degrade we start to receive HTTP 503 erros and then the site shuts down.
Any ideas on what line of investigation to take to isolate a) cause of 503 errors b) degrdation of website.
Any help is much appreciated.
Re: HTTP 503 Errors under Load
Check these things first:
1) Does the Bytes Total/sec approach the bandwidth of the network?
2) Does the CPU usage of your web server reach 90% or higher?
3) What is the limit of the number of connections for the web server? Is it set too low?
4) Does the commited memory approach or exceed the physical memory in your IIS server?
Any "Yes" answer to the above questions can be the cause of the degradation, and probably 503.