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IIS 8 Random 503 service unavailable

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http://serverfault.com – We migrated a busy website to Windows Server 2012 with IIS 8. The website randomly gives the error "503 service unavailable" after an user presses F5 the error is gone again. The website is build in ASP.NET MVC 3. The website runs on one application pool, with default settings There are around 500 to 900 concurrent users on the website during the day, and the error happens more often when there are more 650 users. The CPU and the memory use on the server is stable. There is nothing about the 503 errors in the application log, the IIS log and the event log. Does anyone has any clue what the p (HowTos)

taskli's picture
Submitted by taskli on 12/08/2012

Stories similar to IIS 8 Random 503 service unavailable

I have just installed an IIS server on my Windows 8 laptop (For development purposes). When I try to run the default website, I get HTTP error 503.

The event viewer gives me this: "Application pool 'DefaultAppPool' exceeded its job limit settings." Perhaps there is some configuration I am missing?

I've got 2 web servers with mirrored content. There's a load balancer sitting in front of them.

Starting yesterday we've been getting people complaining about 503 errors. i can't find any 503 errors in the IIS log file. However the server host is saying these errors are due to .Net errors in our website which are causing the app pool to recycle.

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I have created an asp.net website that is to be accessed from client browsers running on the same domain.

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http request 32 weeks 2 days ago

I am running a website but I still have problems with the "service temporarily unavailable error". I want to make a simple check if the website is up and running. Does anybody has an idea how to do it? (the site is password protected, so you have to add a user and pwd before logging in).

Cheers jurgen

My company has one EC2 server running on AWS with a MYSQL-DB and Apache on that the same machine that hosts a website built on PHP Zend Framework.

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