The Subscription Settings service and corresponding application and proxy needs to be running in order to make changes to these settings

I see the following error when I tried to configure my App Url

Execute the following commands

Get-SPManagedAccount contoso\sp_services $appPool = New-SPServiceApplicationPool -Name SubscriptionServiceAppPool -Account $account $serviceApp = New-SPSubscriptionSettingsServiceApplication -ApplicationPool $appPool -name "Subscription Settings Service Application" -DatabaseName "SP2013AppSubscriptionSettingsDB" $serviceAppProxy = New-SPSubscriptionSettingsServiceApplicationProxy -ServiceApplication $serviceApp

Make sure the below services are started

Perform an iisreset

Configure DNS

Create a forward lookup zone for the app domain name

1.       Verify that the user account that performs this procedure is a local administrator on the domain controller.

2.       Click Start, point to Administrative Tools, and then click DNS.

3.       In DNS Manager, right-click Forward Lookup Zones, and then click New Zone….

4.       In the New Zone Wizard, click Next.

5.       In the Zone Type page, accept the default of Primary zone, and then click Next.

6.       In the Active Directory Zone Replication Scope page, select the appropriate replication method for your environment (the default is To all DNS servers in this domain), and then click Next.

7.       In the Zone Name page, in the Zone name box type the name for your new app domain name (for example, ContosoApps.com), and then click Next.

The New Zone Wizard shows the new domain name for apps.

1.       On the Dynamic Update page, select the appropriate type of dynamic updates for your environment (the default is Do not allow dynamic updates), and then clickNext.

2.       On the Completing the New Zone Wizard page, review the settings, and then click Finish.

Create a wildcard Alias (CNAME) record for the new domain name

1.       Verify that the user account that performs this procedure is a local administrator on the domain controller.

2.       In DNS Manager, under Forward Lookup Zones, right-click the new app domain name, and then click New Alias (CNAME).

3.       In the New Resource Record dialog box, in the Alias name (uses parent domain if left blank) box, type *.

The Fully qualified domain name (FQDN) box displays *. followed by the domain name that you created for apps. For example, *.ContosoApps.com or *.Contoso-Apps.com.

4.       Next to the Fully qualified domain name (FQDN) for target host box, type the FQDN of the server that hosts the SharePoint sites.

For example, SharePoint.Contoso.com.

Or:

a.       Next to the Fully qualified domain name (FQDN) for target host box, click Browse and navigate to the Forward Lookup Zone for the domain that hosts the SharePoint sites.

For example, Contoso.com.

b.       And then navigate to the record that points to the server that hosts the SharePoint site.

For example, SharePoint.

New Resource Record dialog box shows the wildcard alias for the app domain and the FQDN of the server that hosts the SharePoint sites.

5.       Click OK.

Go Ahead and Load the Page “Configure App URLs” page, it should load successfully.

Happy SharePointing !