Microsoft Web Application Proxy - WAP on Windows Server 2025

Microsoft Web Application Proxy (WAP) is a service in Windows Server 2025 that allows you to securely publish web applications from inside your corporate network to external users. WAP functions as a reverse proxy and an Active Directory Federation Services (AD FS) proxy to pre-authenticate user access before they reach your internal applications.

Quickly deploy a new Microsoft Web Application Proxy (WAP) server preloaded with the WAP role and PowerShell modules alongside all the prerequisites ready for you to build a new ADFS farm or to add to an existing ADFS farm.

WAP Core Capabilities

Reverse Proxy - Publishes internal web applications to external users without requiring VPN access
Pre-authentication - Integrates with ADFS to authenticate users before they access backend applications
SSL/TLS Termination - Handles SSL certificates and encryption for secure external access
Pass-through Authentication - Supports Kerberos constrained delegation for seamless backend authentication
HTTP to HTTPS Redirection - Automatically redirects insecure traffic to secure connections
Backend Server Pool Support - Load balances across multiple backend servers for high availability

WAP Common Use Cases

Publish SharePoint sites for external collaboration and remote access
Provide secure remote access to Outlook Web Access (OWA) and Exchange services
Enable external access to internal line-of-business web applications
Publish custom web applications without exposing internal network infrastructure
Create secure DMZ for web application access without traditional VPN
Support remote workers accessing corporate applications with MFA protection

WAP Security Features

Pre-authentication with ADFS for claims-based access control
Integration with Azure Multi-factor Authentication for enhanced security
Support for client certificate authentication
HTTP header inspection and manipulation for security policies
Protection against common web attacks by isolating backend servers
Conditional access based on device compliance and user identity

WAP Published Application Support

Microsoft SharePoint Server (on-premises and hybrid)
Microsoft Exchange Server (Outlook Web Access, ActiveSync)
Remote Desktop Gateway services
Custom web applications using HTTP/HTTPS protocols
REST APIs and web services
Claims-aware and non-claims-aware applications

WAP Authentication Methods

ADFS Pre-authentication - Users authenticate through ADFS before accessing applications
Pass-through Authentication - Direct authentication to backend application (no ADFS)
Client Certificate Authentication - Certificate-based authentication for enhanced security
OAuth 2.0 Support - Modern authentication for mobile and web applications
Windows Integrated Authentication - Seamless authentication for domain-joined devices

WAP Management and Configuration

Web Application Proxy Management Console for GUI-based administration
PowerShell cmdlets for automation and scripting
Centralized configuration management across multiple WAP servers
Real-time monitoring and health status reporting
Detailed event logging for troubleshooting and auditing
Integration with Windows Admin Center for modern management experience

WAP Deployment Architecture

DMZ Placement - Typically deployed in perimeter network for security isolation
High Availability - Supports multiple WAP servers behind load balancer
ADFS Integration - Requires functional ADFS infrastructure for pre-authentication
Certificate Requirements - Requires SSL certificates for published applications
Firewall Configuration - Requires port 443 (HTTPS) inbound and outbound connectivity to ADFS

WAP Support and Resources

Follow our getting started guide on setting up Web Application Proxy in Azure - Setting up WAP in Azure

Web Application Proxy - WAP Server

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