# Configure Multiple App Domain

- Link: https://sharepointtechnicalsupport.com/2015/07/20/configure-multiple-app-domain/
- Published: 2015-07-20T09:31:52+05:30
- Author: Deviprasad Panda

# Introduction

One of the feature updates of the March 2013 Public Update for SharePoint 2013 enables
you to use multiple app domains in SharePoint 2013 environments with alternate access
mapping or host-header web application configurations.
  Microsoft introduced a 
new concept with SharePoint 2013 and Office 365 to extend the out of the box functionality
instead of the normal approach of farm solutions now you can add apps (add ins) 
through Java script code or using .net and hosting apps outside SharePoint environment
without need to go and deploy code into SharePoint which increase the re-usability,
enhance the security and assure that SharePoint farm stability and code isolation.
To have apps working you need to configure App Domain which is a corner stone to
have apps working, at some cases you will need to have more than one app domain 
configured so I am going through this topic in the few lines.

## **Why we need multiple App Domains?**

 * You could use app domain on alternate access mappings or host-header web application
   configurations.
 *  Configure an app domain for each web application zone and use alternate access
   mapping and host-header web application configuration.
 *  If you could not Share same app domain because web applications are not having
   same application pool identity and authentication schema is not matching.

# Steps to configure multiple app domain

 Follow the below steps to create another app domain for specific web application
taking into account that you already have a app domain and this is a new one for
your host header web application.

1-    Configure the first app domain: refer to the links below to configure it if
you don’t have existing app domain

2-    Open SharePoint Shell as administrator and run the following commands

$contentService = [Microsoft.SharePoint.Administration.SPWebService]::ContentService

$contentService.SupportMultipleAppDomains = $true $contentService.Update()

3-   Then do IIs reset.

4-   Created Forward Lookup Zone in DNS for another AppDomain (testdomain.mycompany.
com), make sure this is new domain and differes than any     other domain you created
before.
 5-  Then run this command

New-SPWebApplicationAppDomain –AppDomain “testdomain.mycompany.com” –port 81 –WebApplication
[http://testsite.companydomain.com ](http://testsite.companydomain.com ) [This link
is external to TechNet Wiki. It will open in a new window.]

6-    Then do IIS reset.

Note: you need to use a port that is not used before.

**Design Notes:**

 * You cannot use IIS ports that are already being used when you configure app domains.
 * If the app domain is configured to use secure sockets layer (SSL) you must configure
   the app domain to use a wildcard certificate and bind the SSL to a different 
   port from the web application SSL port.

Overall Apps is an important and interesting topic and it is the future for developing
and extending functionality of SharePoint and Office 365 and it differs from case
to case if you need to have one app domain on your on premise environment or more
than one app domain per the design notes and benefits I presented, but I recommend
if you can utilize one app domain and share it across all web application but if
you have design constraints the you can add multiple web app domain knowing that
this will increase the operations effort from configuring and maintaining.

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