Windows Server 2025 ships with targeted IIS updates that reduce module overhead and improve certificate store performance. Administrators managing .NET workloads benefit from these changes when sites must handle high connection counts without custom ISAPI filters.

The following sections focus on repeatable PowerShell patterns rather than GUI steps. Each example uses the current WebAdministration module and avoids deprecated cmdlets.

#Recent IIS Changes in Windows Server 2025

IIS 10.0 in this release alters how the request pipeline loads managed modules. The default application pool now starts with a reduced set of native modules, requiring explicit addition only when needed.

Certificate binding latency has decreased due to improved caching in the HTTP.sys driver. Scripts that previously waited on netsh bindings now complete faster when using the new IISAdministration cmdlets.

#Provisioning Sites and Bindings

Use the following pattern to create a site, assign an application pool, and bind both HTTP and HTTPS endpoints.

powershell 
Import-Module WebAdministration
New-WebAppPool -Name "SitePool2025"
New-Website -Name "CustomerSite" -PhysicalPath "C:\sites\customer" -ApplicationPool "SitePool2025"
New-WebBinding -Name "CustomerSite" -Protocol "https" -Port 443 -HostHeader "app.example.com" -SslFlags 1

#Active Directory Authentication

Windows Server 2025 continues to support Windows Authentication with Kerberos. Configure the module and set the required SPNs via PowerShell.

  • Enable the WindowsAuthentication module at site level only.
  • Set the application pool identity to a domain service account with constrained delegation.
  • Register SPNs for both the NetBIOS and FQDN host names.
powershell 
Set-WebConfigurationProperty -Filter "/system.webServer/security/authentication/windowsAuthentication" -Name "enabled" -Value $true -PSPath "IIS:\Sites\CustomerSite"

#Security and Maintenance Notes

Disable anonymous authentication on administrative endpoints. Schedule weekly restarts of application pools during low-traffic windows to clear memory leaks in long-running .NET processes.

Test all scripts in a lab environment that mirrors production OU structure before applying to live servers.