<div>
Should not be a problem to make Tomcat or Jboss handling more connections (they add some threads, but no significant memory consumption in more connections)
</div>


Should not be a problem to make Tomcat or Jboss handling more connections (they add some threads, but no significant memory consumption in more connections)

<div>
Did you read the support link I provided? &nbsp;It covers IIS 7 too. &nbsp;Just a different parameter.
</div>


Did you read the support link I provided?  It covers IIS 7 too.  Just a different parameter.

<div>
Increasing number of workers did the trick. Also I believe that increasing the queue length might help.
</div>


Increasing number of workers did the trick. Also I believe that increasing the queue length might help.

<div>
<div class="content wysiwyg-content">
Recently I have switched from Apache to IIS and front server for Tomcat/JBoss. I use google analytics - people on site as measurement of traffic. Apache went down with about 2200 visitors while IIS works fine until 4000. Then I start to receive 503 errors. The traffic is load-balanced to 4 nodes (I use ISAPI redirector - tomcat connectors). &nbsp;Any idea why this happens? I don't think it's hardware, CPU is not more than 20%, memory is fine.
</div>
</div>


Recently I have switched from Apache to IIS and front server for Tomcat/JBoss. I use google analytics - people on site as measurement of traffic. Apache went down with about 2200 visitors while IIS works fine until 4000. Then I start to receive 503 errors. The traffic is load-balanced to 4 nodes (I use ISAPI redirector - tomcat connectors).  Any idea why this happens? I don't think it's hardware, CPU is not more than 20%, memory is fine.

IIS problem on heavy traffic

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

Java application servers that support the Java EE platform and features include JOnAS from Object Web, WildFly (formerly JBoss AS) from JBoss, Geronimo from Apache, TomEE from Apache, Resin Java Application Server from Caucho Technology, Blazix from Desiderata Software, Enhydra Server from Enhydra.org, and GlassFish from Oracle. Commercial Java app servers include WebLogic by Oracle, WebSphere from IBM and the open source JBoss Enterprise Application Platform (JBoss EAP) by Red Hat.

Java App Servers

Analytics is the discovery and communication of meaningful patterns in data. Especially valuable in areas rich with recorded information, analytics relies on the simultaneous application of statistics, computer programming and operations research to quantify performance. Specifically, areas within analytics include predictive analytics, prescriptive analytics, enterprise decision management, retail analytics, store assortment and stock-keeping unit optimization, marketing optimization and marketing mix modeling, web analytics, sales force sizing and optimization, price and promotion modeling, predictive science, credit risk analysis, and fraud analytics.