ArcGIS Web Adaptor (IIS) is a component of Portal for ArcGIS that allows you to integrate your portal with your existing web server and your organization's security mechanisms. ArcGIS Web Adaptor is required if you want to use Integrated Windows Authentication with your portal.
The Web Adaptor is an application that runs in your existing website and forwards requests to the machine hosting Portal for ArcGIS. The IIS setup is compatible with IIS in Windows 7, 8, 8.1, 10, Server 2008, 2008 R2, Server 2012, and 2012 R2. This corresponds to IIS versions 7.0, 7.5, 8.0, 8.5, and 10.
Benefits of the Web Adaptor
You can do the following using the Web Adaptor:
Integrate Portal for ArcGIS with your organization's existing web server. By including a web server in your site, you can host web applications that use your GIS services.
Use your organization's identity store and security policies at the web-tier level. For example, if you're using IIS, you can use Integrated Windows Authentication to restrict who enters the portal. You can also use Public Key Infrastructure (PKI) or any other identity store for which the web server has built-in or extensible support. This allows you to provide a single sign-on or other custom authentication experience when logging in to use services, web applications, and Portal for ArcGIS.
Make Portal for ArcGIS available through a site name other than the default: arcgis.
Make Portal for ArcGIS available through port 80 or 443.
You can only use the Web Adaptor with port 80 or 443. Using other ports is not supported.
Web Adaptor deployment scenarios
The Web Adaptor version must always match the version of Portal for ArcGIS. If you've configured multiple Web Adaptors on a single web server, you can use different version numbers for all the Web Adaptors.
The Web Adaptor is platform independent of Portal for ArcGIS; therefore, the Web Adaptor you deploy does not have to match the operating system platform of your portal. For example, if your portal is running on Linux, you can deploy ArcGIS Web Adaptor (IIS) to work with Portal for ArcGIS.
Accessing your portal with the Web Adaptor installed
After installing and configuring the Web Adaptor, the URL that you use to access your portal will be in the format https://webadaptorhost.domain.com/webadaptorname/home. For example, if the machine hosting your Web Adaptor is named wa with the domain myorg.net and your Web Adaptor is named arcgis, you'll access the portal using the URL https://wa.myorg.net/arcgis/home.
If you configured your portal to use HTTPS for all communication, update the installed portal website and help shortcut URLs to use https instead of http; otherwise, you will see failures in your browser when attempting to access the original shortcut URLs.
Web Adaptor setup experience
The Web Adaptor has its own setup and installation guide that is separate from the Portal for ArcGIS installation. You must install the Web Adaptor on a machine running a web server. This can be a machine running Portal for ArcGIS or a separate machine.
To learn more about the setup experience, see An overview of implementing ArcGIS Web Adaptor with Portal for ArcGIS.