Upgrading from IIS 6 to 8.5: increased concurrent requests
问题 We upgraded our web server from Windows Server 2003 to Windows Server 2012 R2. The web application in question runs against ASP.NET 4.0. The web application in turn communicates with a third-party Web API. Shortly after the upgrade, the Web API latency increased, which in turn lead to notable timeouts. I suspected that on IIS 8.5, the number of allowed concurrent requests increased, causing an increase in throughput that the Web API was unable to handle. However: IIS 6 isn't limiting the